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

1 Answer
Nov 20, 2016

Answer:

#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#