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Go Math Grade 3 Chapter 3 Understand Multiplication Extra Practice Answer Key
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Common Core – Page No. 63000
Lesson 3.1
Draw equal groups. Skip count to find how many.
Question 1.
2 groups of 4 ______
Answer:
8
Explanation:
Draw 4 counters in each group.
There are 2 equal groups.
skip count by 4 until you say 2 numbers.
There are 2 equal groups with 4 counters in each group.
So, there are 8 counters in all.
Question 2.
4 groups of 3 ______
Answer:
12
Explanation:
Draw 3 counters in each group.
There are 4 equal groups.
skip count by 3 until you say 4 numbers.
There are 4 equal groups with 3 counters in each group.
So, there are 12 counters in all.
Lesson 3.2
Draw a quick picture to show the equal groups. Then write related addition and multiplication sentences.
Question 3.
2 groups of 5
______ + ______ = ______
______ × ______ = ______
Answer:
5 + 5 = 10
2 x 5 = 10
Explanation:
Addition Sentence
Draw 5 counters in each group.
There are a total of 2 groups.
Now, the addition sentence is 5 + 5 = 10.
Multiplication sentence
Draw 5 counters in each circle or group.
Since there is the same number of counters in each group, multiply counters and groups to find how many there are altogether.
2 x 5 = 10.
factor x factor = product
Question 4.
3 groups of 2
______ + ______ + ______ = ______
______ × ______ = ______
Answer:
2 + 2 + 2 = 6
3 x 2 = 6
Explanation:
Addition Sentence
Draw 2 counters in each group.
There are a total of 3 groups.
Now, the addition sentence is 2 + 2 + 2 = 6
Multiplication sentence
Draw 2 counters in each circle or group.
Since there is the same number of counters in each group, multiply groups and counters to find how many there are altogether.
3 x 2 = 6.
factor x factor = product
Lesson 3.3
1. Draw jumps on the number line to show 3 groups of 6.
Find the product.
Question 5.
3 × 6 = ______
Answer:
Explanation:
3 x 6 = 18
Write the multiplication sentence the number line shows.
Question 6.
______ × ______ = ______
Answer:
4 x 3 = 12
Explanation:
1 jump on the number is considered as 1 group.
There are 3 jumps on a number line. So, there are 3 groups.
The length of each jump is 4.
Begin at 0. Skip count by 3’s.
Multiply 4 x 3 = 12.
Common Core – Page No. 64000
Lesson 3.4
Question 1.
Destiny placed her hair ribbons in 3 groups of 5 on her dresser. How many hair ribbons in all does Destiny have? Draw a diagram to solve.
______ hair ribbons
Answer:
15 hair ribbons
Explanation:
3 groups of 5
Draw 3 counters (hair ribbons) in each group.
There are 5 equal groups (dresser).
We skip count by 3’s until you say 5 numbers (3,6,9,12,15)
There are 15 hair ribbons in all.
Lesson 3.5
Draw an array to find the product.
Question 2.
2 × 7 = ______
Answer:
2 x 7 = 14
Explanation:
2 x 7 = 14
Question 3.
2 × 6 = ______
Answer:
2 x 6 = 12
Explanation:
2 x 6 = 12
Lesson 3.6
Write a multiplication sentence for the model. Then use the Commutative Property of Multiplication to write a related multiplication sentence.
Question 4.
□□□□□
□□□□□
□□□□□
□□□□□
______ × ______ = ______
______ × ______ = ______
Answer:
4 x 5 = 20
5 x 4 = 20
Explanation:
The given image has 4 rows and 5 columns of square boxes. So, multiplication = 4 x 5. Using Commutative Property of Multiplication 4 x 5 = 5 x 4.
Question 5.
______ × ______ = ______
______ × ______ = ______
Answer:
Explanation:
Lesson 3.7
Find the product.
Question 6.
6 × 0 = ______
Answer:
0
Explanation:
The Zero Property of Multiplication states that the product of zero and any number is zero. So, 6 x 0 = 0.
Question 7.
5 × 1 = ______
Answer:
5
Explanation:
Use Commutative Property of Multiplication: 5 x 1 = 1 x 5.
The Identity Property of Multiplication states that the product of any number and 1 is that number. 5 x 1 = 5.
Question 8.
0 × 9 = ______
Answer:
0
Explanation:
The Zero Property of Multiplication states that the product of zero and any number is zero. So, 0 x 9 = 0.
Question 9.
1 × 8 = ______
Answer:
8
Explanation:
The Identity Property of Multiplication states that the product of any number and 1 is that number. 1 x 8 = 8.
Question 10.
1 × 4 = ______
Answer:
4
Explanation:
The Identity Property of Multiplication states that the product of any number and 1 is that number. 1 x 4 = 4.
Question 11.
9 × 1 = ______
Answer:
9
Explanation:
Use Commutative Property of Multiplication: 9 x 1 = 1 x 9.
The Identity Property of Multiplication states that the product of any number and 1 is that number. 9 x 1 = 9.
Question 12.
1 × 0 = ______
Answer:
0
Explanation:
The Zero Property of Multiplication states that the product of zero and any number is zero.
So, 1 x 0 = 0.
Question 13.
7 × 0 = ______
Answer:
0
Explanation:
The Zero Property of Multiplication states that the product of zero and any number is zero.
So, 7 x 0 = 0.
Conclusion
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