Answers

2014-12-13T08:20:20+05:30
Factors of 70 = 1 , 2 , 5 , 7 , 10 , 14 , 35 , 70.

Factors of 45
 = 1 , 3 , 5 , 9 , 10 ,15 , 45.

Common factors of 70 and 45
 = 1 , 5 .

So 

The greatest common factor 70 and 45 is 5.
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2014-12-13T08:25:41+05:30
Factors of 70 are1,2,5,7,10,14,35,70
Factors of 45 are1,3,5,9,10,15,45
Common factors of 70 and 45 are 1,5
Thus the greatest common factor of 70 and 45 is 5
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