Understanding Fact Families

multiplication

100

2 x 4 = 8

4 x 2 = 8

200

3 x 4 = 12

4 x 3 = 12

300

5 x 6 =30

6 x 5 = 30

400

9 x 8 = 72

8 x 9 = 72

500

100 x 200 = 20,000

200 x 100 = 20,000

division

100

6 / 3 = 2

6 / 2 = 3

200

10 / 5 = 2

10 / 2 = 5

300

28 / 3 = 7 

28 / 7 = 3

400

50 / 10 = 5

50 / 5 = 10

500

800 / 20 = 40

800 / 40 = 20

is this a fact family??

100

8, 4, 32

Yes! 

8x4=32, 4x8=32

32/8=4, 32/4=8

200

1, 5, 35

No!

1x5=5, 5x1=1

35/1=35, 35/5= 7

These numbers do not create a product or quotient that lies within the fact family!

300

3, 6, 18

Yes. 

3x6=18, 6x3=18

18/3=6, 18/6=3

400

8, 5, 80

no.

8x5=40, 5x8=40

80/8=10, 80/5=16

These numbers do not create a product or quotient that lies within the fact family!

500

10, 100, 1000

Yes.

10x100=1000, 100x10=1000

1000/10=100, 1000/100=10