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Fraction
Example for Exercise 10 (Page 2) 		Home
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2. Find the GCF of 180, 72, and 210. (Method 2):

Find the factors:(Start with 2,3,4...)


2|180
2|90
3|45
3|15
   5

2|72
2|36
2|18
3|9
   3

 2|210
3|105
5|35
   7
Factors of 180 = 2 x 2 x 3 x 3 x 5

Factors of 72 = 2 x 2 x 2 x 3 x 3

Factors of 210 = 2 x 3 x 5 x 7

Common factors of 180, 72 and 210 are: 2 and 3

GCF = 2 x 3 = 6

3. Find the GCF of 14, 28, and 42. (Method 2):

Find the factors:(Start with 2,3,4...)


2|14
   7

 2|28
2|14
   7

 2|42
3|21
   7
Factors of 14 = 2 x 7

Factors of 28 = 2 x 2 x 7

Factors of 42 = 2 x 3 x 7

Common factors of 14, 28 and 42 are: 2 and 7

GCF = 2 x 7 = 14
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