## Engage NY Eureka Math 3rd Grade Module 7 Lesson 3 Answer Key

Eureka Math Grade 3 Module 7 Answer Key

### Eureka Math Grade 3 Module 7 Lesson 3 Pattern Sheet Answer Key

Multiply.

multiply by 4 (1–5)

Answer:

Explanation:

4 × 1 = 4

4 × 2 = 8

4 × 3 = 12

4 × 4 = 16

4 × 5 = 20

### Eureka Math Grade 3 Module 7 Lesson3 Problem Set Answer Key

Use the RDW process to solve the problems below. Use a letter to represent the unknown in each problem. When you are finished, share your solutions with a partner. Discuss and compare your strategies with your partner’s strategies.

Question 1.

Monica measures 91 milliliters of water into 9 tiny beakers. She measures an equal amount of water into the first 8 beakers. She pours the remaining water into the ninth beaker. It measures 19 milliliters. How many milliliters of water are in each of the first 8 beakers?

Answer:

Amount of water Monica pours into each of the first 8 beakers = 9 milliliters.

Explanation:

Amount of water Monica measures into 9 tiny beakers = 91 milliliters

Amount of water in ninth beaker = 19 milliliters

Amount of water Monica measures into 8 tiny beakers = Amount of water Monica measures into 9 tiny beakers – Amount of water in ninth beaker

= 91 – 19

= 72 milliliters.

Amount of water Monica pours into each of the first 8 beakers = Amount of water Monica measures into 8 tiny beakers ÷ 8

= 72 ÷ 8

= 9 milliliters.

Question 2.

Matthew and his dad put up 8 six-foot lengths of fence on Monday and 9 six-foot lengths on Tuesday. What is the total length of the fence?

Answer:

Total Length of the six-foot fence Matthew and his dad put up on Monday and Tuesday = 17.

Explanation:

Length of the six-foot fence Matthew and his dad put up on Monday = 8

Length of the six-foot fence Matthew and his dad put up on Tuesday = 9

Total Length of the six-foot fence Matthew and his dad put up on Monday and Tuesday = Length of the six-foot fence Matthew and his dad put up on Monday + Length of the six-foot fence Matthew and his dad put up on Tuesday

= 8 + 9

= 17.

Question 3.

The total weight of Laura’s new pencils is 112 grams. One pencil rolls off the scale. Now the scale reads 105 grams. What is the total weight of 7 new pencils?

Answer:

Total weight of 7 new pencils = 98 grams.

Explanation:

Total weight of Laura’s new pencils = 112 grams

Weight of the pencils scale reads now = 105 grams

Weight of One pencil rolls off the scale = Total weight of Laura’s new pencils – Weight of the pencils scale reads now

= 112 – 105

= 7 grams.

Total weight of 7 new pencils = Weight of the pencils scale reads now – Weight of One pencil rolls off the scale

= 105 – 7

= 98 grams.

Question 4.

Mrs. Ford’s math class starts at 8:15. They do 3 fluency activities that each last 4 minutes. Just when they finish all of the fluency activities, the fire alarm goes off. When they return to the room after the drill, it is 8:46. How many minutes did the fire drill last?

Answer:

Time taken for the fire drill last = 19 minutes.

Explanation:

Time of the Mrs. Ford’s math class starts = 8:15.

Time of the Mrs. Ford’s returning to the room after the drill = 8:46

They do 3 fluency activities that each last 4 minutes.

=> Time taken for 3 fluency activities = 4 × 3 = 12 minutes.

Time taken for the Mrs. Ford’s math class to end = Time of the Mrs. Ford’s math class starts + Time taken for 3 fluency activities

= 8:15 + 0:12

= 8:27.

Time taken for the fire drill last = Time of the Mrs. Ford’s returning to the room after the drill – Time taken for the Mrs. Ford’s math class to end

= 8:46 -8:27

= 19 minutes.

Question 5.

On Saturday, the baker bought a total of 150 pounds of flour in five-pound bags. By Tuesday, he had 115 pounds of flour left. How many five-pound bags of flour did the baker use?

Answer:

Amount of five-pound bags of flour used by the baker = 35 pounds.

Explanation:

Amount of total flour bought on Saturday in five-pound bags = 150 pounds.

Amount of flour left by Tuesday = 115 pounds

Amount of five-pound bags of flour used by the baker = Amount of total flour bought on Saturday in five-pound bags – Amount of flour left by Tuesday

= 150 – 115

= 35 pounds.

Question 6.

Fred cut an 84-centimeter rope into 2 parts and gave his sister 1 part. Fred’s part is 56 centimeters long. His sister cut her rope into 4 equal pieces. How long is 1 of his sister’s pieces of rope?

Answer:

Length of each piece of rope Fred’s sister makes = 7 centimeters.

Explanation:

Total length of the Fred rope had= 84 centimeter

Length of Fred’s rope part= 56 centimeters

Length of Fred’s sister part rope = Total length of the Fred rope had – Length of Fred’s rope part

= 84 – 56

= 28.

His sister cut her rope into 4 equal pieces.

=> Number of pieces of rope Fred’s sister makes = 4

=> Length of each piece of rope Fred’s sister makes = Length of Fred’s sister part rope ÷ Number of pieces of rope Fred’s sister makes

= 28 ÷ 4

= 7 centimeters.

### Eureka Math Grade 3 Module 7 Lesson 3 Exit Ticket Answer Key

Use the RDW process to solve the problem below. Use a letter to represent the unknown.

Twenty packs of fruit snacks come in a box. Each pack weighs 6 ounces. Students eat some. There are 48 ounces of fruit snacks left in the box. How many ounces of fruit snacks did the students eat?

Answer:

Weight of packs of fruit snacks students ate = 72 ounces.

Explanation:

Weight of each pack = 6 ounces.

Number of fruit snacks come in a box = 20

Weight of 20 pack of fruit snacks = 20 × 6 = 120 ounces.

Weight of packs of fruit snacks left over in the box = 48 ounces

Weight of packs of fruit snacks students ate = Weight of 20 pack of fruit snacks + Weight of packs of fruit snacks left over in the box

= 120 – 48

= 72 ounces.

### Eureka Math Grade 3 Module 7 Lesson 3 Homework Answer Key

Use the RDW process to solve the problems below. Use a letter to represent the unknown in each problem.

Question 1.

Jerry pours 86 milliliters of water into 8 tiny beakers. He measures an equal amount of water into the first 7 beakers. He pours the remaining water into the eighth beaker. It measures 16 milliliters. How many milliliters of water are in each of the first 7 beakers?

Answer:

Amount of water he pours equally into the each first seven beakers = 10 milliliters.

Explanation:

Amount of water Jerry pours into 8 tiny beakers = 86 milliliters

Amount of water he pours into the eighth beaker = 16 milliliters

Amount of water he pours into the first seven beakers = Amount of water Jerry pours into 8 tiny beakers – Amount of water he pours into the eighth beaker

= 86 – 16

= 70 milliliters.

Number of first beakers = 7

Amount of water he pours equally into the each first seven beakers = Amount of water he pours into the first seven beakers ÷ Number of beakers

= 70 ÷ 7

= 10 milliliters.

Question 2.

Mr. Chavez’s third graders go to gym class at 11:15. Students rotate through three activities for 8 minutes each. Lunch begins at 12:00. How many minutes are there between the end of gym activities and the beginning of lunch?

Answer:

Time taken between the end of gym activities and the beginning of lunch = 21 minutes.

Explanation:

Time of Mr. Chavez’s third graders go to gym class = 11:15

Time of they Lunch begins = 12:00

Students rotate through three activities for 8 minutes each.

=> Time taken for three activities = 8 × 3 = 24 minutes.

Time totally taken for the gym activities = Time of Mr. Chavez’s third graders go to gym class + Time taken for three activities

= 11:15 + 24

= 11:39.

Time taken between the end of gym activities and the beginning of lunch = Time of they Lunch begins – Time totally taken for the gym activities

=12:00 – 11.39

= 21 minutes.

Question 3.

A box contains 100 pens. In each box there are 38 black pens and 42 blue pens. The rest are green pens. Mr. Cane buys 6 boxes of pens. How many green pens does he have in total?

Answer:

Number of Green pens Mr. Cane has = 120.

Explanation:

Number of pens a box contains = 100

Number of Black pens present in each box = 38

Number of Blue pens present in each box = 42

Number of Green pens present in each box = Number of pens a box contains – ( Number of Black pens present in each + Number of Blue pens present in each box )

= 100 – ( 38 + 42)

= 100 – 80

= 20.

Number of boxes of pens Mr. Cane buys = 6

Number of Green pens Mr. Cane has = Number of Green pens present in each box × Number of boxes of pens Mr. Cane buys

= 20 × 6

= 120.

Question 4.

Greg has $56. Tom has $17 more than Greg. Jason has $8 less than Tom.

a. How much money does Jason have?

b. How much money do the 3 boys have in total?

Answer:

a. Amount of money Jason has = $65.

b. Total amount of money 3 boys have = $194.

Explanation:

Amount of money Greg has = $56

Tom has $17 more than Greg.

=> Amount of money Tom has = Amount of money Greg has + $17

= $56 + $17

= $73.

a) Jason has $8 less than Tom.

=> Amount of money Jason has = Amount of money Tom has – $8

= $73 – $8

= $65.

b) Amount of money Greg has = $56

Amount of money Tom has = $73

Amount of money Jason has = $65.

Total amount of money 3 boys have = Amount of money Greg has + Amount of money Tom has + Amount of money Jason has

= $56 + $73 + $65

= $129 + $ 65

= $194.

Question 5.

Laura cuts 64 inches of ribbon into two parts and gives her mom one part. Laura’s part is 28 inches long. Her mom cuts her ribbon into 6 equal pieces. How long is one of her mom’s pieces of ribbon?

Answer:

Length of the each pieces her moms cut her ribbon part = 6 inches.

Explanation:

Total Length of ribbon Laura has = 64 inches

Length of Ribbon Laura’s part = 28 inches

Length of Ribbon Laura’s mom’s part = Total Length of ribbon Laura has – Length of Ribbon Laura’s part

= 64 – 28

= 36

Number of equal pieces her moms cut her ribbon part = 6

Length of the each pieces her moms cut her ribbon part = Length of Ribbon Laura’s mom’s part ÷ Number of equal pieces her moms cut her ribbon part

= 36 ÷ 6

= 6 inches.