Greatest common factor - GreatSchools

Greatest common factor

Circle the common factors. Write the greatest common factor (GCF). 24: 1, 2, 3, 4, 6, 8, 12, 24 60: 1, 2, 3, 4, 5, 6, 8, 10, 12, 60 42: 1, 2, 3, 6, 7, 14

The GCF is 6

Find the factors. Circle the common factors.

45:

36:

28:

54:

Find the factors. Write the GCF.

35:

80:

The GCF is

32: The GCF is

12:

The GCF is 54:

64:

44: 12, 24 72:

The GCF is

? Dorling Kindersley Limited [2010]

15: 18:

9

Greatest common factor

CCirircclleetthheeccoommmmoonnffaaccttoorrss.. WWrrititeetthheeggrreeaatteessttccoommmmoonnffaaccttoorr((GGCCFF)).. 2244:: 11,, 2,23, , 43,, 6,4,8, 61,2, 82,4 12, 24 6600:: 11,, 2,23, , 43,, 5,4,6, 58,, 160,, 182,, 6010, 12T, he6G0 CF is The GCF is 6 4422:: 11,, 2,23, , 63,, 7,6,14 7, 14

Find the factors. Circle the common factors.

45:

36:

1, 3, 5, 9, 15, 45

1, 2, 3, 4, 6, 8, 9, 12, 18, 36

28: 1, 2, 4, 7, 14, 28

Find the factors. Write the GCF. 35: 1, 5, 7, 35

The GCF is 5

54: 1, 2, 3, 6, 9, 18, 54

80: 1, 2, 4, 5, 8, 10, 20, 40, 80

32: 1, 2, 4, 8, 16, 32

The GCF is 32

12: 1, 2, 3, 4, 6, 12

The GCF is 3

54: 1, 2, 3, 6, 9, 18, 27, 54

The GCF is 18

64: 1, 2, 4, 8, 16, 32, 64

44: 1, 2, 3, 4, 6, 8, 12, 24

15: 1, 3, 5, 15

72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36

18: 1, 2, 3, 6, 9, 18

It is common for children to skip some of the factors of a number. Have them test factors systematically, beginning with 2, and then 3, and so on.

3

? Dorling Kindersley Limited [2010]

 ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download