Fact Families

Objective

Today we will learn to write multiplication and division fact families.

Definitions

Addend - Any number being added.

6 + 5 = 11 Inverse Operation - An opposite

operation that undoes another.

5 + 4 = 9 9 - 5 = 4

Let’s Review

Addition/Subtraction Fact Families are found by: Starting with a simple addition fact. ( 2

+ 5 = 7) Changing the addends around. (5 + 2 = 7) Writing the Inverse operations for both. (7 - 2 = 5 & 7 - 5 = 2)

What are the 4 members of the Fact Family of

3 + 4 = 7?

3 + 4 = 7 4 + 3 = 7 7 - 3 = 4 7 - 4 = 3

What are the 4 members of the Fact Family of

8 + 1 = 9?

8 + 1 = 9 1 + 8 = 9 9 - 8 = 1 9 - 1 = 8

Definitions

Factors - The numbers being multiplied.

4 x 8 = 32 Inverse Operation - An opposite

operation that undoes another. 4 x 8 = 32 32 / 4 = 8

Multiplication

Multiplication/Division Fact Families are found by:

Starting with a simple multiplication fact. ( 3 x 9 = 27)

Changing the Factors around. (9 x 3 = 27) Writing the Inverse operations for both. (27 / 3 = 9 & 27 / 9 = 3)

What are the 4 members of the Fact Family of

3 x 7 = 21?

3 x 7 = 21 7 x 3 = 21 21 / 3 = 7 21 / 7 = 3

model

What are the 4 members of the Fact Family of

6 x 4 = 24?

6 x 4 = 24 4 x 6 = 24 24 / 6 = 4 24 / 4 = 6

Multiplication/Division Fact Families are found by:

Starting with a simple multiplication fact. ( 3 x 9 = 27)

Changing the Factors around. (9 x 3 = 27) Writing the Inverse operations for both. (27 / 3 = 9 & 27 / 9 = 3)

What are the 4 members of the Fact Family of

7 x 8 = 56?

7 x 8 = 56 8 x 7 = 56 56 / 7 = 8 56 / 8 = 7

Guided

What are the 4 members of the Fact Family of

9 x 7 = 63?

9 x 7 = 63 7 x 9 = 63 63 / 9 = 7 63 / 7 = 9

What are the 4 members of the Fact Family of

6 x 7 = 42?

6 x 7 = 42 7 x 6 = 42 42 /6 = 7 42 / 7 = 6

Multiplication/Division Fact Families are found by:

Starting with a simple multiplication fact. ( 3 x 9 = 27)

Changing the Factors around. (9 x 3 = 27) Writing the Inverse operations for both. (27 / 3 = 9 & 27 / 9 = 3)

CFU

Closure

A fact family will have two multiplication problems and two division problems.

Inverse Operation - An opposite operation that undoes another.

3x4=12 *** 12/ 4 = 3

Independent Practice

Write a multiplication and division fact family for the following:

1) 5 x6 = 30 6) 9x8 = 72 2) 8x3 = 24 7) 4x8 = 32 3) 7x2 = 14 8) 3x9 = 27

4) 6x8 = 48 9) 9x 2 =18

5) 2x4 = 8 10) 4x 6 = 24

Answers

1) 5 x6 = 30 6x5=30 30/6=5 30/5=6 2) 8x3=24 3x8=24 24/8=3 24/3=8 3) 7x2=24 2x7=14 14/2=7 14/7=2 4) 6x8=48 8x6=48 48/6=8 48/8=6 5) 2x4=8 4x2=8 8/4=2 8/2=4

6) 9x8=72 8x9=72 72/9=8 72/8=07) 4x8=32 8x4=32 32/8=4 32/4=88) 3x9=27 9x3=27 27/9=3 27/3=99) 9x2=18 2x9=18 18/9=2 18/2=910) 4x6=24 6x4=24 24/6=4 24/4=6