 # What is 7/10 + 2/12? 7 10
+
 2 12

## Step 1

Can you add yet? Nope! The denominators don't match. We need a common denominator. So next we take both denominators and multiply them. Next, take each numerator and multiply it by the denominator of the other term.

So, we multiply 7 by 12, and get 84, then we multiply 10 by 12 and get 120. Now for the second term. You multiply 2 by 10, and get 20, then multiply 10 by 12 and get 120. We now have a new problem, that looks like this:

 84 120
+
 20 120

## Step 2

Since our denominators match, we can add the numerators.

84 + 20 = 104

That gives us the sum, which is

 104 120

## Step 3

Now, do we need to simplify this fraction?

First, we attempt to divide it by 2...

Are both the numerator and the denominator evenly divisible by 2? Yes! So we reduce it:

 104 120
÷ 2 =
 52 60

Now, try the same number again.

Are both the numerator and the denominator evenly divisible by 2? Yes! So we reduce it:

 52 60
÷ 2 =
 26 30

Now, try the same number again.

Are both the numerator and the denominator evenly divisible by 2? Yes! So we reduce it:

 26 30
÷ 2 =
 13 15

Now, try the same number again.

Nope. Try the next prime number, 3...

Nope. Try the next prime number, 5...

Nope. Try the next prime number, 7...

Nope. Try the next prime number, 11...

Nope. Try the next prime number, 13...

Nope. Try the next prime number, 17...

No good. 17 is larger than 13. So we're done reducing.