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Greatest Common Factors

Directions: Find the greatest common factor for both numbers below.

1.

 

165, 25

 

2.

 

20, 60

 

3.

 

18, 36

 

4.

 

99, 33

 

5.

 

160, 20

 

6.

 

30, 120

 

7.

 

9, 5

 

8.

 

160, 80

 

9.

 

54, 180

 

10.

 

104, 117

 

11.

 

48, 120

 

12.

 

17, 25

 

13.

 

48, 56

 

14.

 

48, 70

 

15.

 

14, 16

 

16.

 

12, 3

 

17.

 

3, 14

 

18.

 

12, 36

 

19.

 

24, 12

 

20.

 

15, 144

 

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