Engage NY Eureka Math 3rd Grade Module 1 Lesson 8 Answer Key
Eureka Math Grade 3 Module 1 Answer Key
Eureka Math Grade 3 Module 1 Lesson 8 Problem Set Answer Key
Question 1.
Draw an array that shows 5 rows of 3.
Explanation:
Drawn an array that shows 5 rows of 3 as 5 × 3 as shown above.
Question 2.
Draw an array that shows 3 rows of 5.
Explanation:
Drawn an array that shows 3 rows of 5 as 3 × 5 as shown above.
Question 3.
Write multiplication expressions for the arrays in Problems 1 and 2. Let the first factor in each expression represent the number of rows. Use the commutative property to make sure the equation below is true.
Explanation:
Wrote multiplication expressions for the arrays in Problems 1 and 2 as 5 × 3, 3 × 5 and let the first factor in each expression represent the number of rows.
Used the commutative property to make sure the equation below is true as 5 × 3 = 15, 3 × 5 = 15,
So, 5 × 3 = 3 × 5 is true equals to 15.
Question 4.
Write a multiplication sentence for each expression.
You might skip-count to find the totals. The first one is done for you.
a. 2 threes: 2 × 3 = 6
b. 3 twos: _________________
c. 3 fours: ________________
d. 4 threes: ________________
e. 3 sevens: ________________
f. 7 threes: ________________
g. 3 nines: _________________
h. 9 threes: ________________
i. 10 threes: _______________
b. 3 twos : 3 x 2 = 6,
Explanation:
Given 3 twos, 3 multiplied by 2 gives 6,
So, 3 × 2 = 6.
c. 3 fours: 3 × 4 = 12,
Explanation:
Given 3 fours, 3 multiplied by 4 gives 12,
So, 3 × 4 = 12.
d. 4 threes: 4 × 3 = 12,
Explanation:
Given 4 threes, 4 multiplied by 3 gives 12,
So, 4 × 3 = 12.
e. 3 sevens: 3 x 7 = 21,
Explanation:
Given 3 sevens, 3 multiplied by 7 gives 21,
So, 3 × 7 = 21.
f. 7 threes: 7 × 3 = 21,
Explanation:
Given 7 threes, 7 multiplied by 3 gives 21,
So, 7 × 3 = 21.
g. 3 nines: 3 × 9 = 27,
Explanation:
Given 3 nines, 3 multiplied by 9 gives 27,
So, 3 × 9 = 27.
h. 9 threes: 9 × 3 = 27,
Explanation:
Given 9 threes, 9 multiplied by 3 gives 27,
So, 9 × 3 = 27.
i. 10 threes: 10 x 3 =30,
Explanation:
Given 10 threes, 10 multiplied by 3 gives 30,
So, 10 × 3 = 30.
Question 5.
Find the unknowns that make the equations true.
Then, draw a line to match related facts.
a. 3 + 3 + 3 + 3 + 3 = _________
b. 3 × 9 = _________
c. 7 threes + 1 three = _________
d. 3 × 8 = _________
e. _________ = 5 × 3
f. 27 = 9 × _________
a. 3 + 3 + 3 + 3 + 3 = 15,
Explanation:
Given 3 + 3 + 3 + 3 + 3 adding 3, 5 times gives 15,
So 3 + 3 + 3 + 3 + 3 = 15.
b. 3 × 9 = 27,
Explanation:
Given 3 × 9, 3 multiplied by 9 gives 27,
So 3 × 9 = 27.
c. 7 threes + 1 three = 8 threes = 24,
Explanation:
Given 7 threes + 1 three = 7 × 3 + 1 × 3 = 21 + 3 = 24,
So, 7 threes + 1 three = 8 threes = 24.
d. 3 × 8 = 24,
Explanation:
Given 3 × 8, 3 multiplied by 8 gives 24,
So 3 × 8 = 24.
e. 15 = 5 × 3,
Explanation:
Given 5 × 3, 5 multiplied by 3 gives 15,
So 15 = 5 × 3.
f. 27 = 9 × 3
Explanation:
Given 27 = 9 × ___, Lets take missing number as x,
27 = 9 × x, So x = 27 ÷ 9 = 3, So 27 = 9 × 3.
Question 6.
Isaac picks 3 tangerines from his tree every day for 7 days.
a. Use circles to draw an array that represents the
tangerines Isaac picks.
Explanation:
Given Isaac picks 3 tangerines from his tree every day for 7 days.
a. Used circles to draw an array that represents the tangerines Isaac picks as 3 × 7 as shown above.
b. How many tangerines does Isaac pick in 7 days?
Write and solve a multiplication sentence to find the total.
Isaac picks 21 tangerines in 7 days,
Multiplication sentence to find the total is 3 x 7 = 21.
Explanation:
Wrote and solved a multiplication sentence to find the total as 3 x 7 = 21, therefore Isaac picks 21 tangerines in 7 days.
c. Isaac decides to pick 3 tangerines every day for 3 more days.
Draw x’s to show the new tangerines on the array in Part (a).
Explanation:
Given Isaac decides to pick 3 tangerines every day for 3 more days.
Drawn x’s to show the new tangerines on the array in Part (a) as shown above in the picture.
d. Write and solve a multiplication sentence to find the total number of tangerines Isaac picks.
Multiplication sentence is 3 x 10 = (3 × 7) + (3 × 3) = 21 + 9 = 30,
The total number of tangerines Isaac picks are 30,
Explanation:
Wrote and solved a multiplication sentence as
3 x 10 = (3 × 7) + (3 × 3) = 21 + 9 = 30,
Therefore the total number of tangerines Isaac picks are 30.
Question 7.
Sarah buys bottles of soap. Each bottle costs $2.
a. How much money does Sarah spend if she buys 3 bottles of soap?
_____$2_____ × ____3______ = $___6_____
b. How much money does Sarah spend if she buys 6 bottles of soap?
_____$2_____ × _____6_____ = $__12______
a. Sarah spends $6 if she buys 3 bottles of soap,
Explanation:
Given Sarah buys bottles of soap. Each bottle costs $2,
So money spent by Sarah if she buys 3 bottles of soap are
$2 × 3 = $6.
b. Sarah spends $12 if she buys 6 bottles of soap,
Explanation:
Given Sarah buys bottles of soap. Each bottle costs $2,
So money spent by Sarah if she buys 6 bottles of soap are $2 × 6 = $12.
Eureka Math Grade 3 Module 1 Lesson 8 Exit Ticket Answer Key
Mary Beth organizes stickers on a page in her sticker book.
She arranges them in 3 rows and 4 columns.
a. Draw an array to show Mary Beth’s stickers.
b. Use your array to write a multiplication sentence to find Mary Beth’s total number of stickers.
c. Label your array to show how you skip-count to solve your multiplication sentence.
d. Use what you know about the commutative property to write a different multiplication sentence for your array.
a. 
Explanation:
Given Mary Beth organizes stickers on a page in her sticker book. She arranges them in 3 rows and 4 columns.
Drawn an array as 3 × 4 to show Mary Beth’s stickers.
b. Mary Beth’s total number of stickers are 12,
Explanation:
Used my array to write a multiplication sentence as 3 × 4 = 12, in finding Mary Beth’s total number of stickers.
c.
Explanation:
Labeled my array to show skip-count to 12 and solved my multiplication sentence as 3 x 4 = 12.
d. Commutative property to write a different multiplication sentence for my array is 3 × 4 = 4 x 3,
Explanation:
Used what I know about the commutative property to write a different multiplication sentence for my array as
3 × 4 = 4 x 3.
Eureka Math Grade 3 Module 1 Lesson 8 Homework Answer Key
Question 1.
Draw an array that shows 6 rows of 3.
Explanation:
Drawn an array that shows 6 rows of 3 as 6 × 3 as shown above.
Question 2.
Draw an array that shows 3 rows of 6.
Explanation:
Drawn an array that shows 3 rows of 6 as 3 × 6 as shown above.
Question 3.
Write multiplication expressions for the arrays in Problems 1 and 2. Let the first factor in each expression represent the number of rows. Use the commutative property to make sure the equation below is true.
Explanation:
Wrote multiplication expressions for the arrays in Problems 1 and 2 as 6 × 3, 3 × 6 and let the first factor in each expression represent the number of rows.
Used the commutative property to make sure the equation below is true as 6 × 3 = 18, 3 × 6 = 18,
So, 6 × 3 = 3 × 6 is true equals to 18.
Question 4.
Write a multiplication sentence for each expression.
You might skip-count to find the totals. The first one is done for you.
a. 5 threes: 5 × 3 = 15
b. 3 fives: __________________
c. 6 threes: ________________
d. 3 sixes: ___________________
e. 7 threes: __________________
f. 3 sevens: __________________
g. 8 threes: ________________
h. 3 nines: _________________
i. 10 threes: _______________
b. 3 fives: 3 × 5 = 15,
Explanation:
Given 3 fives, 3 multiplied by 5 gives 15,
So, 3 × 5 = 15.
c. 6 threes: 6 × 3 = 18,
Explanation:
Given 6 threes, 6 multiplied by 3 gives 18,
So, 6 × 3 = 18.
d. 3 sixes: = 3 × 6 = 18,
Explanation:
Given 3 sixes, 3 multiplied by 6 gives 18,
So, 3 × 6 = 18.
e. 7 threes: 7 × 3 = 21,
Explanation:
Given 7 threes, 7 multiplied by 3 gives 21,
So, 7 × 3 = 21.
f. 3 sevens: 3 × 7 = 21,
Explanation:
Given 3 sevens, 3 multiplied by 7 gives 21,
So, 3 × 7 = 21.
g. 8 threes: 8 × 3 = 24,
Explanation:
Given 8 threes, 8 multiplied by 3 gives 24,
So, 8 × 3 = 24.
h. 3 nines: 3 × 9 = 27,
Explanation:
Given 3 nines, 3 multiplied by 9 gives 27,
So, 3 × 9 = 27.
i. 10 threes: 10 × 3 = 30,
Explanation:
Given 10 threes, 10 multiplied by 3 gives 30,
So, 10 X 3 = 30.
Question 5.
Find the unknowns that make the equations true. Then, draw a line to match related facts.
a. 3 + 3 + 3 + 3 + 3 + 3 = _________
b. 3 × 5 = _________
c. 8 threes + 1 three = _________
d. 3 × 9 = _________
e. _________ = 6 × 3
f. 15 = 5 × _________
a. 3 + 3 + 3 + 3 + 3 + 3 = 18,
Explanation:
Given 3 + 3 + 3 + 3 + 3 + 3 adding 3, 6 times gives 18,
So 3 + 3 + 3 + 3 + 3 + 3 = 18.
b. 3 × 5 = 15,
Explanation:
Given 3 × 5, 3 multiplied by 5 gives 15,
So 3 × 5 = 15.
c. 8 threes + 1 three =9 threes = 27,
Explanation:
Given 8 threes + 1 three = 8 × 3 + 1 × 3 = 24 + 3 = 27,
So, 8 threes + 1 three = 9 threes = 27.
d. 3 × 9 = 27,
Explanation:
Given 3 × 9, 3 multiplied by 9 gives 27,
So 3 × 9 = 27.
e. 18 = 6 × 3,
Explanation:
Given 6 × 3, 6 multiplied by 3 gives 18,
So 18 = 6 × 3.
f. 15 = 5 × 3,
Explanation:
Given 15 = 5 × ___, Lets take missing number as x,
15 = 5 × x, So x = 15 ÷ 5 = 3, So 15 = 5 × 3.
Question 6.
Fernando puts 3 pictures on each page of his photo album.
He puts pictures on 8 pages.
a. Use circles to draw an array that represents the total number of pictures in Fernando’s photo album.
b. Use your array to write and solve a multiplication sentence to find Fernando’s total number of pictures.
c. Fernando adds 2 more pages to his book. He puts 3 pictures on each new page. Draw x’s to show the new pictures on the array in Part (a).
d. Write and solve a multiplication sentence to find the new the total number of pictures in Fernando’s album.
a.
Explanation:
Given Fernando puts 3 pictures on each page of his photo album.
He puts pictures on 8 pages.
a. Used circles to draw an array that represents the total number of pictures in Fernando’s photo album as 3 X 8.
b. Multiplication sentence for Fernando’s total number of pictures is 3 X 8 = 24,
Explanation:
Used my array to write and solve a multiplication sentence to find Fernando’s total number of pictures as 3 X 8 = 24.
c.
Explanation:
Fernando adds 2 more pages to his book. He puts 3 pictures on each new page. Drawn x’s to show the new pictures on the array in Part (a) as shown above.
d. Multiplication sentence is 3 x 10 =
(3× 8) + (3 × 2) = 24 + 6 = 30,
The new total number of pictures in Fernando’s album are 30,
Explanation:
Wrote and solved a multiplication sentence as
3 x 10 = (3 × 8) + (3 × 2) = 24 + 6 = 30,
Therefore the new total number of pictures in Fernando’s album are 30.
Question 7.
Ivania recycles. She gets 3 cents for every can she recycles.
a. How much money does Ivania make if she recycles 4 cans?
____3______ × ___4_______ = ___12_____ cents
b. How much money does Ivania make if she recycles 7 cans?
____3______ × ____7______ = ____21____ cents
a. Ivania makes 12 cents if she recycles 4 cans,
Explanation:
Given Ivania recycles and she gets 3 cents for every can she recycles,
So money Ivania makes if she recycles 4 cans is
3 cents × 4 = 12 cents.
b. Ivania makes 21 cents if she recycles 7 cans,
Explanation:
Given Ivania recycles and she gets 3 cents for every can she recycles,
So money Ivania makes if she recycles 7 cans is
3 cents × 7 = 21 cents.