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Here's another one:

Find the common multiples of

5 and 7
 

5 :  5 , 10 , 15 , 20 , 25 , 30 , ( 35 ) , 40 , 45 , 50 , 55 , 60 , 65 , 70 , ...
7 :  7 , 14 , 21 , 28 , ( 35 ) , 42 , 48 , 56 , 63 , 70 , ...

 

The common multiples of5and 7are 35 , 70 , ...


Notice that, since these lists go on forever, we can't list all of the common factors.

 


YOUR TURN:

Find the common multiples of

2 and 7


2 , 4 and 6