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Go Math Grade 2 Chapter 9 Answer Key Length in Metric Units Concepts
Check out the topics before starting your preparation for the exams. We have provided solutions for all the questions as per the textbook. Test yourself by solving the problems given in the mid-chapter checkpoint and review the test. By solving the review test problems you can know how much you have learned from this chapter. Click on the below-given links and kickstart your preparation.
Chapter: 9 – Length in Metric Units
- Length in Metric Units Show What You Know
- Length in Metric Units Vocabulary Builder
- Length in Metric Units Game Estimating Length
- Length in Metric Units Vocabulary Game
Lesson: 1 Measure with a Centimeter Model
Lesson: 2 Estimate Lengths in Centimeters
Lesson: 3 Measure with a Centimeter Ruler
Lesson: 4 Problem Solving • Add and Subtract Lengths
- Lesson 9.4 Problem Solving • Add and Subtract Lengths
- Problem Solving • Add and Subtract Lengths Homework & Practice 9.4
Mid-Chapter Checkpoint
Lesson: 5 Centimeters and Meters
Lesson: 6 Estimate Lengths in Meters
Lesson: 7 Measure and Compare Lengths
Review/Test
Length in Metric Units Show What You Know
Compare Lengths
Question 1.
Order the strings from shortest to longest.
Write 1, 2, 3.
Answer:
By seeing the above figure we can order the strings from shortest to longest.
Use Nonstandard Units to Measure Length
Question 2.
Answer:
about 7 cubes
Explanation:
Use the cube to measure the length of the pencil. The estimated measure of a pencil is 7
Question 3.
Answer:
about 7 cubes
Explanation:
Use the cube to measure the length of the pen. The estimated measure of a pen is 7.
Measure Length Twice: Nonstandard Units
Question 4.
Answer: about 21 linking cubes
Question 5.
Answer: about 9
Length in Metric Units Vocabulary Builder
Visualize It
Fill in the graphic organizer. Think of an object and write about how you can measure the length of that object.
Understand Vocabulary
Use the color tiles to estimate the length of each straw.
Question 1.
about _______ tiles
Answer: 6 tiles
By using the color tiles we can measure the length of the straw.
Question 2.
about ______ tiles
Answer: 3 tiles
By using the color tiles we can measure the length of the straw.
Length in Metric Units Game Estimating Length
Materials
Play with a partner.
- Take turns choosing a picture. Find the real object.
- Each player estimates the length of the object in cubes and then makes a cube train for his or her estimate.
- Compare the cube trains to the length of the object. The player with the closer estimate puts a counter on the picture. If there is a tie, both players put a counter on the picture.
- Repeat until all pictures are covered. The player with more counters on the board wins.
Length in Metric Units Vocabulary Game
Go Fish
For 3 players
Materials
- 4 sets of word cards
How to Play
- Every player is dealt 5 cards. Put the rest face-down in a draw pile.
- Ask another player for a word card to match a word card you have.
- If the player has the word card, he or she gives it to you. Put both cards in front of you. Take another turn.
- If the player does not have the word, he or she answers, “Go fish.” Take a card from the pile. If the word you get matches one you are holding, put both cards in front of you. Take another turn. If it does not match, your turn is over.
- The game is over when one player has no cards left. The player with the most pairs wins.
The Write Way
Reflect
Choose one idea. Write about it in the space below.
- Compare a centimeter to a meter. Explain how they are alike and how they are different.
- Explain how you would find the length of this crayon in centimeters.
How would you compare the length of a door to the length of a window in meters? Draw pictures and write to explain. Use another piece of paper for your drawing.
Lesson 9.1 Measure with a Centimeter Model
Essential Question How do you use a centimeter model to measure the lengths of objects?
Listen and Draw
Use 
to measure the length.
______ unit cubes
Answer: 8 unit cubes
______ unit cubes
Answer: 13 unit cubes
______ unit cubes
Answer: 9 unit cubes
HOME CONNECTION • Your child used unit cubes as an introduction to measurement of length before using metric measurement tools.
MATHEMATICAL PRACTICES
Use Tools
Describe how to use unit cubes to measure an object’s length.
Answer:
We can measure the length of the object by locating the unit cubes in a sequence.
Share and Show
Use a unit cube. Measure the length in centimeters.
Question 1.
about ________ centimeters
Answer: about 22 centimeters as one cube is equal to one centimeter
Question 2.
about _________ centimeters
Answer: about 13 centimeters as one cube is equal to one centimeter
Question 3.
about ________ centimeters
Answer: about 13 centimeters as one cube is equal to one centimeter
On Your Own
Use a unit cube. Measure the length in centimeters.
Question 4.
about _________ centimeters
Answer: 7 centimeters as one cube is equal to one centimeter
Question 5.
about ________ centimeters
Answer: about 18 centimeters as one cube is equal to one centimeter
Question 6.
about ________ centimeters
Answer: about 14 centimeters as one cube is equal to one centimeter
Question 7.
about __________ centimeters
Answer: about 10 centimeters as one cube is equal to one centimeter
Question 8.
about __________ centimeters
Answer: about 17 centimeters as one cube is equal to one centimeter
Problem Solving • Applications
Solve. Write or draw to explain.
Question 9.
THINK SMARTER
Mrs. Duncan measured the lengths of a crayon and a pencil. The pencil is double the length of the crayon. The sum of their lengths is 24 centimeters. What are their lengths?
crayon : _____________________
pencil : _____________
Answer:
Let the length of the crayon be x
Length of a pencil = 2x
As according to the question that the sum of their length is 24 centimeters.
So we have
x + 2x = 24
3x = 24
x = 8
Thus the length of the crayon = 8 centimeters
Length of pencil = 2x
Substitute the value of x
2 × 8 = 16
Thus the length of pencil is 16 centimeters and
length of crayons is 8 centimeters.
Question 13.
THINK SMARTER +
Marita uses unit cubes to measure the length of a straw. Circle the number in the box that makes the sentence true.
Answer: The straw is 7 centimeters long.
TAKE HOME ACTIVITY • Have your child compare the lengths of other objects to those in this lesson.
Measure with a Centimeter Model Homework & Practice 9.1
Use a unit cube. Measure the length in centimeters.
Question 1.
about _______ centimeters
Answer: about 8 centimeters
Question 2.
about _________ centimeters
Answer: about 11 centimeters
Question 3.
about ________ centimeters
Answer: about 15 centimeters
Problem Solving
Solve. Write or draw to explain.
Question 4.
Susan has a pencil that is 3 centimeters shorter than this string. How long is the pencil?
about _________ centimeters
Answer: about 15 centimeters
Question 5.
WRITE
Write about using a unit cube to measure lengths in this lesson.
______________
_____________
Answer:
Let us say your cube has the dimensions of 3 × 4 × 5 to find the area of the cube in the cubic measure you would multiply the three dimensions together and divide by the area of the cubes.
Lesson Check
Question 1.
Sarah used unit cubes to measure the length of a ribbon. Each unit cube is about 1 centimeter long. What is a good estimate for the length of ribbon?
_________ centimeters
Answer: 6 centimeters
Spiral Review
Question 2.
What is the time on this clock?
Answer: 10 : 00
Question 3.
What is the time on this clock?
Answer: 04 : 40
Question 4.
Dan has a paper strip that is 28 inches long. He tears 6 inches off the strip. How long is the paper strip now?
_________ inches
Answer: 22 inches.
Explanation:
Given Dan has a paper strip that is 28 inches long
He tears 6 inches off the strip
so 28 inches – 6 inches = 22 inches
22 inches long is the paper strip.
Question 5.
Rita has 1 quarter, 1 dime, and 2 pennies. What is the total value of Rita’s coins?
$ ______ or ______ cents
Answer:
Quarter = 25 cents
dime = 10 cents
2 pennies = 2 cents
25 + 10 + 2 = 37 cents
Thus the total value of Rita’s coins 37 cents.
Lesson 9.2 Estimate Lengths in Centimeters
Essential Question How do you use known lengths to estimate unknown lengths?
Listen and Draw
Find three classroom objects that are shorter than your 10-centimeter strip. Draw the objects. Write estimates for their lengths.
about ________ centimeters
about ________ centimeters
about ________ centimeters
HOME CONNECTION • Your child used a 10-centimeter strip of paper to practice estimating the lengths of some classroom objects.
MATHEMATICAL PRACTICES
Which object has a length closest to 10 centimeters? Explain.
Answer:
Share and Show
Question 1.
The yarn is about 5 centimeters long.
Circle the best estimate for the length of the crayon.
Answer: 10 centimeters
Question 2.
The string is about 12 centimeters long.
Circle the best estimate for the length of the straw.
Answer: 7 centimeters
On Your Own
Question 3.
The rope is about 8 centimeters long. Circle the best estimate for the length of the paper clip.
Answer: 4 centimeters
Question 4.
The pencil is about 11 centimeters long.
Circle the best estimate for the length of the chain.
Answer: 13 centimeters
Question 5.
The hair clip is about 7 centimeters long.
Circle the best estimate for the length of the yarn.
Answer: 10 centimeters
Question 6.
The ribbon is about 13 centimeters long.
Circle the best estimate for the length of the string.
Answer: 11 centimeters
Problem Solving • Applications
Question 7.
THINK SMARTER
For each question, circle the best estimate.
Answer:
Question 8.
MATHEMATICAL PRACTICE
Analyze Mr. Lott has 250 more centimeters of tape than Mrs. Sanchez. Mr. Lott has 775 centimeters of tape. How many centimeters of tape does Mrs. Sanchez have?
________ centimeters
Answer: 525 centimeters
Explanation:
Given,
Mr. Lott has 250 more centimeters of tape than Mrs. Sanchez.
Mr. Lott has 775 centimeters of tape.
To find the length of tape we have to subtract 250 from 775
775 – 250 = 525 centimeters
Question 9.
THINK SMARTER
This feather is about 7 centimeters long. Rachel says the yarn is about 14 centimeters long. Is Rachel correct? Explain.
________________
_________________
Answer: Yes Rachel is correct because the yarn is double length of the feather.
TAKE HOME ACTIVITY • Give your child an object that is about 5 centimeters long. Have him or her use it to estimate the lengths of some other objects.
Estimate Lengths in Centimeters Homework & Practice 9.2
Question 1.
The toothpick is about 6 centimeters long. Circle the best estimate for the length of the yarn.
Answer: 9 centimeters
Question 2.
The pen is about 11 centimeters long. Circle the best estimate for the length of the eraser.
Answer: 4 centimeters
Problem Solving
Question 3.
The string is about 6 centimeters long. Draw a pencil that is about 12 centimeters long.
Answer:
Question 4.
WRITE
Choose one exercise above. Describe how you decided which estimate was the best choice.
Answer: Lesson 9.2 Estimate Lengths in Centimeters in this exercise we estimate the length of an object by comparing with the other object. So, this was the best choice.
Lesson Check
Question 1.
The pencil is about 12 centimeters long. Estimate the length of the yarn.
Answer: 5 centimeters
Spiral Review
Question 2.
Jeremy has 58 baseball cards. He gives 23 of them to his sister. How many baseball cards does Jeremy have left?
Answer: Jeremy left 35 baseball cards
Question 3.
What is the sum?
14 + 65 = ______
Answer: 79
Question 4.
Adrian has a cube train that is 13 inches long. He adds 6 inches of cubes to the train. How long is the cube train now?
_______ inches
Answer: 19 inches
Explanation:
Given,
Adrian has a cube train that is 13 inches long.
He adds 6 inches of cubes to the train.
13 + 6 = 19 inches
Question 5.
What is the total value of this group of coins?
$ _______, or ______ cents
Answer: 41c
Lesson 9.3 Measure with a Centimeter Ruler
Essential Question How do you use a centimeter ruler to measure lengths?
Listen and Draw
Find three small objects in the classroom.
Use unit cubes to measure their lengths.
Draw the objects and write their lengths.
HOME CONNECTION • Your child used unit cubes to measure the lengths of some classroom objects as an introduction to measuring lengths in centimeters.
MATHEMATICAL PRACTICES
Apply. Compare
Describe how the three lengths compare. Which object is shortest?
Answer: pencil with 7 centimeters is shortest
Share and Show
Measure the length to the nearest centimeter.
Question 1.
_______ centimeters
Answer: about 19 centimeters
Question 2.
_______ centimeters
Answer: about 10 centimeters
Question 3.
________ centimeters
Answer: about 15 centimeters
On Your Own
Measure the length to the nearest centimeter.
Question 4.
________ centimeters
Answer: 18 centimeters
Question 5.
_______ centimeters
Answer: 10 centimeters
Question 6.
________ centimeters
Answer: 12 centimeters
Question 7.
________ centimeters
Answer: 17 centimeters
Question 8.
GO DEEPER
A marker is almost 13 centimeters long. This length ends between which two centimeter-marks on a ruler?
____________________
_____________________
Answer:
It ends between 13 cm and 14 cm mark.
Explanation:
Since this marker in the above question is almost 13 centimeters long and definitely ends between two centimeter marks, the two centimeters that the length of this marker ends between on a ruler should be 13cm and 14 cm marks on the ruler.
Problem Solving • Applications
Question 9.
THINK SMARTER
The crayon was on the table next to the centimeter ruler. The left edge of the crayon was not lined up with the zero mark on the ruler.
What is the length of the crayon?
Explain how you found your answer.
____________________
____________________
Answer: 8 centimeter
Explanation:
Shown in the given figure that length of the crayon is between 3 to 11 cms
hence 11-3 we get 8 centimeters
Question 10.
THINK SMARTER
This is Lee’s string. Hana’s string is 7 centimeters long. Whose string is longer? Use a centimeter ruler to find out. Explain.
____________________
___________________
Answer: Hana’s string is longer than Lee’s string.
TAKE HOME ACTIVITY • Have your child measure the lengths of some objects using a centimeter ruler.
Measure with a Centimeter Ruler Homework & Practice 9.3
Measure the length to the nearest centimeter.
Question 1.
_________ centimeters
Answer: 9 centimeters
Question 2.
__________ centimeters
Answer: 12 centimeters
Problem Solving
Question 3.
Draw a string that is about 8 centimeters long.
Then use a centimeter ruler to check the length.
Answer:
Question 4.
WRITE
Measure the length of the top of your desk in centimeters.
Describe how you found the length.
___________________
___________________
Answer: 12 centimeters
by using rulers found the length of the desk
Lesson Check
Question 1.
Use a centimeter ruler. What is the length of this pencil to the nearest centimeter?
_______ centimeters
Answer: 12 centimeters
Spiral Review
Question 2.
What is the time on this clock?
Answer: 04 : 05
Question 3.
What is the total value of this group of coins?
$ ______ or ______ cents
Answer: 41c
Question 4.
Use the line plot. How many pencils are 5 inches long?
______ pencils
Answer: 2
Lesson 9.4 Problem Solving • Add and Subtract Lengths
Essential Question How can drawing a diagram help when solving problems about lengths?
Nate had 23 centimeters of string.
He gave 9 centimeters of string to Myra.
How much string does Nate have now?
Unlock the Problem
What information do
I need to use?
Nate had _________ centimeters of string.
He gave _______ centimeters of string to Myra.
Show how to solve the problem.
Nate has ________ centimeters of string now.
Answer: Nate has 14 centimeters of string now.
HOME CONNECTION • Your child drew a diagram to represent a problem about lengths. The diagram can be used to choose the operation for solving the problem.
Try Another Problem
Draw a diagram. Write a number sentence using a ☐ for the missing number. Then solve.
Question 1.
Ellie has a ribbon that is 12 centimeters long. Gwen has a ribbon that is 9 centimeters long. How many centimeters of ribbon do they have?
______________
They have _________ centimeters of ribbon.
Answer:
12 + 9 = 21 cm
Thus They have 21 centimeters of ribbon.
Question 2.
A string is 24 centimeters long. Justin cuts 8 centimeters off. How long is the string now?
___________
Now the string is _________ centimeters long.
Answer: 16 cm
24 – 8 = 16 cm
Now the string is 16 centimeters long.
MATHEMATICAL PRACTICES
Explain how your diagram shows what happened in the first problem.
Answer:
Share and Show
Draw a diagram. Write a number sentence using a ☐ for the missing number. Then solve.
Question 3.
A chain of paper clips is 18 centimeters long. Sondra adds 6 centimeters of paper clips to the chain. How long is the chain now?
_____________
The chain is _______ centimeters long now.
Answer:
18 + 6 = 24 cm
Thus The chain is 24 centimeters long now.
Question 4.
THINK SMARTER
A ribbon was 22 centimeters long. Then Martha cut a piece off to give to Tao. Now the ribbon is 5 centimeters long. How many centimeters of ribbon did Martha give to Tao?
Martha gave _________ centimeters of ribbon to Tao.
Answer:
Given,
A ribbon was 22 centimeters long. Then Martha cut a piece off to give to Tao. Now the ribbon is 5 centimeters long.
22 – 5 = 17 cm
Thus Martha gave 17 centimeters of ribbon to Tao.
TAKE HOME ACTIVITY • Have your child explain how he or she used a diagram to solve one problem in this lesson.
Problem Solving • Add and Subtract Lengths Homework & Practice 9.4
Draw a diagram. Write a number sentence using a ☐ for the missing number. Then solve.
Question 1.
A straw is 20 centimeters long. Mr. Jones cuts off 8 centimeters of the straw. How long is the straw now?
________________
The straw is _______ centimeters long now.
Answer:
Given,
A straw is 20 centimeters long.
Mr. Jones cuts off 8 centimeters of the straw.
20 – 8 = 12 cm
The straw is 12 centimeters long now.
Question 2.
WRITE
Describe a diagram for a problem about the total length of two ribbons, 13 centimeters long and 5 centimeters long.
Answer:
13 + 5 = 18 centimeters
Lesson Check
Question 1.
Tina has a paper clip chain that is 25 centimeters long. She takes off 8 centimeters of the chain. How long is the chain now?
________ centimeters
Answer:
Given,
Tina has a paper clip chain that is 25 centimeters long. She takes off 8 centimeters of the chain.
25 – 8 = 17 centimeters
The chain is 17 centimeters long.
Spiral Review
Question 2.
What is the sum?
Answer: 472
Question 3.
What is another way to write the time half past 7?
_____ : ______
Answer: 07 : 30
Question 4.
Molly has these coins in her pocket. How much money does she have in her pocket?
$ ______ or ______ cents
Answer:
1 quarter = 25 cents
1 dime = 10 cents
1 dime = 10 cents
1 nickel = 5 cents
25c + 10c + 10c + 5c + 50c
= 100 cents
Length in Metric Units Mid-Chapter Checkpoint
Concepts and Skills
Use a unit cube. Measure the length in centimeters.
Question 1.
about ______ centimeters
Answer: about 11 centimeters
Question 2.
about ________ centimeters
Answer: about 7 centimeters
Question 3.
The pencil is about 11 centimeters long. Circle the best estimate for the length of the string.
Answer: 7 centimeters
Question 4.
THINK SMARTER
Use a centimeter ruler. What is the length of this ribbon to the nearest centimeter?
_______ centimeters
Answer: 16 centimeters
Lesson 9.5 Centimeters and Meters
Essential Question How is measuring in meters different from measuring in centimeters?
Listen and Draw
Draw or write to describe how you did each measurement.
1st measurement
2nd measurement
MATHEMATICAL PRACTICES
Describe how the lengths of the yarn and the sheet of paper are different.
Answer:
Share and Show
Measure to the nearest centimeter.
Then measure to the nearest meter.
Question 1.
______ centimeters
______ meters
Answer:
100 centimeters
1 meters
Question 2.
______ centimeters
______ meters
Answer: 2.5 meters
250 centimeters
2.5 meters
Question 3.
______ centimeters
______ meters
Answer:
400 centimeters
4 meters
On Your Own
Measure to the nearest centimeter.
Then measure to the nearest meter.
Question 4.
______ centimeters
______ meters
Answer: 2 meters
200 centimeters
2 meters
Question 5.
______ centimeters
______ meters
Answer:
150 centimeters
1.5 meters
Question 6.
______ centimeters
______ meters
Answer:
200 centimeters
2 meters
Question 7.
GO DEEPER
Write these lengths in order from shortest to longest.
Answer:
200 centimeters
1 meter
10 meters
Problem Solving • Applications
Question 8.
THINK SMARTER
Mr. Ryan walked next to a barn. He wants to measure the length of the barn. Would the length be a greater number of centimeters or a greater number of meters? Explain your answer.
Answer:
Meters as it is a realistic figure, centimeters would be far too small.
Question 9.
THINK SMARTER
Write the word on the tile that makes the sentence true.
A bench is 2 _______ long.
A pencil is 15 _______ long.
A paper clip is 3 ______ long.
A bed is 3 ______ long.
Answer:
A bench is 2 meters long.
A pencil is 15 centimeters long.
A paper clip is 3 centimeters long.
A bed is 3 meters long.
TAKE HOME ACTIVITY • Have your child describe how centimeters and meters are different.
Centimeters and Meters Homework & Practice 9.5
Measure to the nearest centimeter.
Then measure to the nearest meter.
Question 1.
______ centimeters
______ meters
Answer:
150 centimeters
1.5 meters
Question 2.
______ centimeters
______ meters
Answer:
100 centimeters
1 meter
Problem Solving
Question 3.
Sally will measure the length of a wall in both centimeters and meters. Will there be fewer centimeters or fewer meters? Explain.
_________________
_________________
Answer:
There would be a fewer meter. Since 1 m=100 cm.
Fewer centimeters because there will be fewer centimeters
Question 4.
WRITE
Would you measure the length of a bench in centimeters or in meters? Explain your choice.
Answer: Meters
Step-by-step explanation:
Reason: Usually, the bench length is bigger than the length of the chair and the table.
So it will be measured using meters. If we use a meter it will easy to measure and accurate because it somewhat bigger in length than a chair and table.
1 meter = 100 centimeters.
The standard length of a bench will 1.5 meters to 2 meters. Usually, 3 to 4 people will sit on the bench.
Lesson Check
Question 1.
Use a centimeter ruler. What is the length of the toothbrush to the nearest centimeter?
______ centimeters
Answer: 14 centimeters
Spiral Review
Question 2.
List a group of coins that equals 65 cents.
____________
_____________
Answer:
Question 3.
Janet has a poster that is about 3 feet long. Fill in the blanks with the word inches or feet to make the statement true.
3 ______ is longer than 12 ________.
Answer:
The measurement of feets is longer than inches.
1 feet = 12 inches
So, 3 feet is longer than 12 inches.
Question 4.
Last week, 483 children checked books out from the library. This week, only 162 children checked books out from the library. How many children checked out library books in the last two weeks?
Answer:
Given,
Last week, 483 children checked books out from the library.
This week, only 162 children checked books out from the library.
483
+162
642
Question 5.
List a group of coins with a value of $1.00?
______________
_____________
Answer:
100 pennies, 20 nickels, 10 dimes, or 4 quarters
Lesson 9.6 Estimate Lengths in Meters
Essential Question How do you estimate the lengths of objects in meters?
Listen and Draw
Find an object that is about 10 centimeters long. Draw and label it.
Answer: pencil
Is there a classroom object that is about 50 centimeters long? Draw and label it.
Answer: No
MATHEMATICAL PRACTICES
Describe how the lengths of the two real objects compare.
Answer: Measure the length of an object twice, using length units of different lengths for the two measurements
Model and Draw
Estimate. About how many meter sticks will match the width of a door?
about ______ meters
Answer: about 1 meter
Share and Show
Find the real object.
Estimate its length in meters.
Question 1.
bookshelf
about _______ meters
Answer: 2 meters
Question 2.
bulletin board
about _______ meters
Answer: 1 meter
On Your Own
Find the real object.
Estimate its length in meters.
Question 3.
teacher’s desk
about _______ meters
Answer: 2.5 meters
Question 4.
wall
about _______ meters
Answer: 4 meters
Question 5.
window
about _______ meters
Answer: 2 meters
Question 6.
chalkboard
about _______ meters
Answer: 2 meters
Problem Solving • Applications
Question 7.
THINK SMARTER
R In meters, estimate the distance from your teacher’s desk to the door of your classroom.
about ________ meters
Explain how you made your estimate.
___________________
___________________
Answer: 3 meters
Explanation: by estimating the distance from your teacher’s desk to the door of your classroom
in meters we will get 3 meters by using measuring tape
Question 8.
THINK SMARTER
Estimate the length of an adult’s bicycle. Fill in the bubble next to all the sentences that are true.
Answer:
The bicycle is about 200 centimeters long.
The bicycle is less than 1 meter long.
TAKE HOME ACTIVITY • With your child, estimate the lengths of some objects in meters.
Estimate Lengths in Meters Homework & Practice 9.6
Find the real object.
Estimate its length in meters.
Question 1.
poster
about ________ meters
Answer: 2 meters
Question 2.
chalkboard
about ________ meters
Answer: 2 meters
Problem Solving
Question 3.
Barbara and Luke each placed 2 meter sticks end-to-end along the length of a large table. About how long is the table?
about ________ meters
Answer: 4 meters
Question 4.
WRITE
Choose one object from above. Describe how you estimated its length.
__________________
__________________
Answer: Table
By comparing with the real world we can estimate the length of the table.
Lesson Check
Question 1.
What is the best estimate for the length of a real baseball bat?
_______ meter
Answer: 1 meter
Question 2.
What is the best estimate for the length of a real couch?
_______ meters
Answer: 2 meter
Spiral Review
Question 3.
Sara has two $1 bills, 3 quarters, and 1 dime. How much money does she have?
$ ____ . _____
Answer: $1 + $0.25 + $0.10 = $1.35
Question 4.
Use an inch ruler. What is the length of this straw to the nearest inch?
_______ inches
Answer: 3 inches
Question 5.
Scott has this money in his pocket. What is the total value of this money?
$ _____ . _____
Answer: $1.15
Lesson 9.7 Measure and Compare Lengths
Essential Question How do you find the difference between the lengths of two objects?
Listen and Draw
Measure and record each length.
_______ centimeters
Answer: 14 centimeters
_______ centimeters
Answer: 8 centimeters
HOME CONNECTION • Your child measured these lengths as an introduction to measuring and then comparing lengths.
MATHEMATICAL PRACTICES
Name a classroom object that is longer than the paintbrush. Explain how you know.
Answer: Chalk board
as it is 2 meters long which is more than a paint brush
Model and Draw
How much longer is the pencil than the crayon?
The pencil is _______ centimeters longer than the crayon.
Answer: 3 centimeters
Share and Show
Measure the length of each object. Complete the number sentence to find the difference between the lengths.
Question 1.
The string is ________ centimeters longer than the straw.
Answer: 13 – 9 = 4 centimeters
Question 2.
The paintbrush is ________ centimeters longer than the toothpick.
Answer: 15 – 5 = 10 centimeters
On Your Own
Measure the length of each object. Complete the number sentence to find the difference between the lengths.
Question 3.
The yarn is ________ centimeters longer than the crayon.
Answer: 10 – 8 = 2
Question 4.
The string is ________ centimeters longer than the paper clip.
Answer:
8 – 4 = 4 centimeters
Question 5.
THINK SMARTER
Use a centimeter ruler. Measure the length of your desk and the length of a book.
desk: ______ centimeters
book: ______ centimeters
Which is shorter? __________
How much shorter is it? __________
Answer:
book is shorter than desk.
Problem Solving • Applications
Analyze Relationships
Question 6.
Mark has a rope that is 23 centimeters long. He cuts 15 centimeters off. What is the length of the rope now?
_________ centimeters
Answer: 8 centimeters
Question 7.
The yellow ribbon is 15 centimeters longer than the green ribbon. The green ribbon is 29 centimeters long. What is the length of the yellow ribbon?
_________ centimeters
Answer: 44 centimeters
Question 8.
THINK SMARTER +
Measure the length of each object. Which object is longer? How much longer? Explain.
________________
__________________
Answer: Marker is 11 centimeters
and the string is 6 centimeters
hence the marker is longer than the string
TAKE HOME ACTIVITY • Have your child tell you how he or she solved one of the problems in this lesson.
Measure and Compare Lengths Homework & Practice 9.7
Measure the length of each object. Write a number sentence to find the difference between the lengths.
Question 1.
The craft stick is ________ centimeters longer than the chalk.
Answer: 3 centimeters
Explanation:
The length of the craft stick is 8 centimeters
The length of chalk is 6 centimeters
11 – 8 = 3
Thus the craft stick is 3 centimeters longer than the chalk.
Problem Solving
Solve. Write or draw to explain.
Question 2.
A string is 11 centimeters long, a ribbon is 24 centimeters long, and a large paper clip is 5 centimeters long. How much longer is the ribbon than the string?
________ centimeters longer
Answer: 19 centimeters longer
Question 3.
WRITE
Suppose the lengths of two strings are 10 centimeters and 17 centimeters. Describe how the lengths of these two strings compare.
_____________________
______________________
Answer:
The length of the second string is 7 centimeters longer than the first string.
Lesson Check
Question 1.
How much longer is the marker than the paper clip? Circle the correct answer.
11 centimeters longer
8 centimeters longer
10 centimeters longer
5 centimeters longer
Answer: 11 centimeters
Spiral Review
Question 2.
What is the total value of these coins?
$ _______ or ______ cents
Answer: 100 cents and 1 $
Question 3.
What is a reasonable estimate for the length of a real chalkboard?
_______ feet
Answer: 5 feet
Question 4.
Cindy leaves at half past 2. At what time does Cindy leave?
___ : ___
Answer: 02:30
Length in Metric Units Review/Test
Question 1.
Michael uses unit cubes to measure the length of the yarn. Circle the number in the box that makes the sentence true.
Answer: The yarn is 4 centimeters long.
Question 2.
The paper clip is about 4 centimeters long. Robin says the string is about 7 centimeters long. Gale says the string is about 20 centimeters long.
Which girl has the better estimate? Explain.
_______________
_______________
Answer: Robin has a better estimation.
Question 3.
GO DEEPER
Sandy’s paper chain is 14 centimeters long. Tim’s paper chain is 6 centimeters long. How many centimeters of the paper chain do they have? Draw a diagram. Write a number sentence using a ☐ for the missing number. Then solve.
____________
The paper chain is _________ centimeters long now.
Answer:
Given,
Sandy’s paper chain is 14 centimeters long. Tim’s paper chain is 6 centimeters long.
14 + 6 = 20
The paper chain is 20 centimeters long now.
Question 4.
Write the word on the tile that makes the sentence true.
A hallway is 4 ______ long.
A marker is 15 ______ long.
A toothpick is 5 ______ long.
A sofa is 2 _______ long.
Answer:
A hallway is 4 meters long.
A marker is 15 centimeters long.
A toothpick is 5 centimeters long.
A sofa is 2 meters long.
Question 5.
Estimate the length of a real car. Fill in the bubble next to all the sentences that are true.
Answer:
The car is less than 6 meters long
Question 6.
THINK SMARTER
Measure the length of each object. Does the sentence describe the objects? Choose Yes or No.
Answer: By seeing the above figure we can say that the crayon is 4 centimeters shorter than the marker.
Question 7.
Ethan’s rope is 25 centimeters long. Ethan cuts the rope and gives a piece to Hank. Ethan’s rope is now 16 centimeters long. How many centimeters of rope does Hank have?
Draw a diagram. Write a number sentence using a ☐ for the missing number. Then solve.
______________
Hank has ________ centimeters of rope.
Answer:
Given,
Ethan’s rope is 25 centimeters long.
Ethan cuts the rope and gives a piece to Hank.
Ethan’s rope is now 16 centimeters long.
25 – 16 = 9 centimeters
Thus Hank has 9 centimeters of rope.
Question 8.
Measure the length of the paintbrush to the nearest centimeter. Circle the number in the box that makes the sentence true.
Answer: The paintbrush is about 14 centimeters long.
Conclusion:
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