1/15+1/6=?

Step by step

First find the same denominator

15 30 45

6 12 18 24 30

The same denominator is 30.

What you do to the denominator you must do to the numerator.

So multiply

1/15 * 2/2 = 2/30

1/6 * 5/5 = 5/30

Then add

2/30 + 5/30 = 7/30