What is the sum of 7/10 two different ways

2/10 + 5/10 = (2+5) / 7/10

Or

3/10 + 4/10 = (3+4) / 10 = 7/10

You can come up with other ways as long as

a) the numerators add to 7

b) the denominators are both 10

If you want the denominators to be different, then you can have something like

1/5 + 1/2 = 2/10 + 5/10 = 7/10