Greatest Common Factor
List all of the factors of the following numbers
12
×6
(including the number 1)
30
×10
×
×30
120
10×

List all of the common numbers on both sides of the

line at the bottom in order from least to greatest.

2
17
6
side A
,
8
23
44
13
,
11
,
45
12
,
19
9
7
,
11
side B
45
44
12
8
3
2

What factors are common (the same) for the following

sets of numbers?

1×8
2×4

List the common  factors in order from  least to

greatest.

8
,
1×18
2×9
3×6
18
1×21
3×7
21
,
2×14
1×28
4×7
28
GCF=

1,2,3,4,5,

6,7,8,9

What is the Greatest Common Factor of each set of

numbers?

Set #1
2,4,6,8,10

3,4,5,6,7,

8,9,10,11,

12,13

GCF=
Set #2

3,6,9,12,

15,18

Find the GCF of the set of numbers:
4,6
12
6
2
4
Find the GCF of the set of numbers:
12,8
12
8
24
4
Find the GCF of the set of numbers:
16, 24
16
8
24
2
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