Question

How do you add `3/7+7/9`?

Answer 1

`1 13/63`

Explanation:

When adding fractions, you first need a common denominator. `3/7 and 7/9` do not have the same denominator, but both 7 and 9 can go into 63.
So,
`3/7*9/9=27/63 and 7/9*7/7=49/63`. Now they have common denominators, and are still equal to the original fractions because they were multiplied by what equals to 1. `7/7=1, 9/9=1`.

Now, we simply put them side by side and add up the numerators. You do not add the denominators.
`27/63+49/63=76/63`

You can now convert to proper fractions.

`1 13/63`