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GCF and LCM
Multiplying and Dividing on a Numberline
Rewriting Addition to Multiplication
Multiplicative Comparison
Multiplying by 10 and 100s/ Fact Families
100

Find the GCF

8 and 12

4

100

3x6

6x3

18

100

8+8+8

8X3

100

27 is 9 times as many as 3

27=9x3

100

60x5

300

200

Find the LCM.

18 and 9

18
200

18/2

9

200

4+4+4+4

4X4

200

90 is 10 times as many as 9

9=10x9

200

80X5

400

300

Find the GCF.

6, 18, and 27

3

300

5x4=

4x5=

20

300

2+2+2+2+2+2+2+2+2

2x9

300

63 is 9 times as many as 7

63=9x7

300

300/50

6

400

Find the LCM.

20, 40, and 80

80

400

5x6

6x5

30

400

5+5+5

15

400

12x12=144

12 times as many 12 is 144

400

3,500/50

70

500

Find the GCF.

50, 80, and 40

10

500

10x2

2x10

20

500

100+100

100x2

500

98x2=196

98 times as many as 2 is 196

500

Write a fact family for 96, 12, and 8

8x12=96

12x8=96

96/12=8

96/8=12