The fraction given is 2/6.
The first five multiples of the denominator are as follows;

The other fraction is 7/10.
The first five multiples of the denominator are as follows;

Basically, you simply multiply the denominator by any series of numbers, in this case from 1 to 5. Therefore you'll have
6 x 1 = 6, 6 x 2 = 12, and so on. The same principle applies to the other denominator, that is 10.