3rd Grade Go Math Chapter 3 Review

3rd Grade Go Math Chapter 3 Review

We have learned A LOT in this chapter

• Basics of multiplication - equal groups and repeated addition

• Skip count on a number line

• Model multiplication with array

• Commutative property

• and one last thing..... multiplying with 1 and 0

Multiplication Basics!

Factors are the two numbers that we multiply

We multiply two factors to get a product

Multiple Choice

Is the missing number a factor or a product? 3 x 9 = ___

• factor

• product

Multiple Choice

Is the missing number a factor or a product? ___ x 6 = 12

• factor

• product

Multiplication is equal groups put together

3 groups of 2 is 6

7groups of 3 is 21

4 groups of 4 is 16

Multiple Choice

Write a multiplication sentence for the equal groups

• 2 x 3

• 3 + 3

• 2 + 3

Multiple Choice

Write 3 groups of 5 as a multiplication sentence

• 3 x 5 = 15

• 3 + 5 = 8

• 3 x 3 x 3 x 3 x 3

Skip Count on a Number Line

We start at 0 and then skip count in equal groups until we find the product. 3x6=?

Start at 0

Skip to 3

Skip to 6

Skip to 9

Skip to 12

Skip to 15

Skip to 18

Multiple Choice

What multiplication fact does this show?

• 2 x 5 = 10
• 3 x 4 = 12
• 3 x 3 = 9
• 3 x 1 = 3

Multiple Choice

What multiplication sentence matches the number line?

• 3 x 7 = 21
• 7 + 7 + 7= 21
• 7 x 7 = 21
• 4 x 7 =21

Model Multiplication with Arrays

We can use arrays to model multiplication. You can use the columns and rows to show the factors and the total number is the product.

Multiple Choice

Which multiplication sentence matches this array?

• 4 X 8 =32

• 4 X 4 =16

• 3 X 3 = 9

Multiple Choice

Which multiplication matches this array?

• 4 X 3 = 12

• 5 X 5 = 25

• 4 X 3 = 16

Commutative Property

The commutative property says that the order of the factors does not matter, they will still give the same product.

Multiple Choice

8 + 4 = 12, so 4+8 =

• 12

• 3

• 4

Multiple Choice

Which shows the Commutative Property of Multiplication

• 3 x 4 = 6 x 2

• 3 x 4 = 12 x 1

• 3 x 4 = 4 x 3

Multiplying by 0 and 1

• Anything times 0 is 0

• 6x0=0 and 72x0=0

• Zero is a very powerful number

• Anything times 1 doesn't change.

• 6x1=6 and 72x1=72

• Let's practice!

Multiple Choice

9 x 1 =

• 91

• 9

• 1

Multiple Choice

0 x 8 =

• 80

• 8

• 0

Great Work 3rd Graders!