Relate Multiplication and Division

You can use fact families to find unknown factors.

EXAMPLE

Write the fact family for each array or set of numbers.

21 ÷ 3 = 7        21 ÷ 7 = 3

Practice Questions

1.  Write the fact family that describes the array below.

2.  Write the fact family that describes the array below.

3.  Write a fact family that uses the numbers below.

   3, 7, 21

4.  Write a fact family that uses the numbers below. 

   3, 5, 15

5.  Write a fact family that uses the numbers below. 

   4, 8, 32

6.  Complete the fact family.

     6  x  3  =   ?               ?      3  = 6

     3  x  ?  =  18              18    ?  =  3

7.  Complete the fact family.

     7  x  2  =  ?               ?      2  =  7

     2  x  ?  =  14              14    ?  =  2

8.  Complete the fact family.

     6  x  4  =  ?               ?      6  =  4

     4  x  ?  =  24              24    ?  =  6

9.  There are 5 rows and 7 chairs in each row. What fact family can you write with this information?

Answers

1. 

8 x 2 = 16

2 x 8 = 16

16 ÷ 8 = 2

16 ÷ 2 = 8

2.

9 x 4 = 36

4 x 9 = 36

36 ÷ 9 = 4

36 ÷ 4 = 9

3.

3 x 7 = 21

7 x 3 = 21

21 ÷ 7 = 3

21 ÷ 3 = 7

4.

3 x 5 = 15

5 x 3 = 15

15 ÷ 3 = 5

15 ÷ 5 = 3

5.

4 x 8 = 32

8 x 4 = 32

32 ÷ 8 = 4

32 ÷ 4 = 8

6.

6 x 3 = 18

3 x 6 = 18

18 ÷ 3 = 6

18 ÷ 6 = 3

7.

7 x 2 = 14

2 x 7 = 14

14 ÷ 2 = 7

14 ÷ 7 = 2

8.

6 x 4 = 24

4 x 6 = 24

24 ÷ 6 = 4

24 ÷ 4 = 6

9.

5 x 7 = 35

7 x 5 = 35

35 ÷ 7 = 5

35 ÷ 5 = 7