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

Nov 20, 2016

#### Answer:

$1 \frac{13}{63}$

#### Explanation:

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

Now, we simply put them side by side and add up the numerators. You do not add the denominators.
$\frac{27}{63} + \frac{49}{63} = \frac{76}{63}$

You can now convert to proper fractions.

$1 \frac{13}{63}$