 # What is 8/12 + 5/10? 8 12
+
 5 10

## 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 8 by 10, and get 80, then we multiply 12 by 10 and get 120. Now for the second term. You multiply 5 by 12, and get 60, then multiply 12 by 10 and get 120. We now have a new problem, that looks like this:

 80 120
+
 60 120

## Step 2

Since our denominators match, we can add the numerators.

80 + 60 = 140

 140 120

## 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:

 140 120
÷ 2 =
 70 60

So far so good... let's try to divide by that number again.

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

 70 60
÷ 2 =
 35 30

So far so good... let's try to divide by that number again.

No good. So next you try the next prime number, which is 3...

No good. So next you try the next prime number, which is 5...

Are both the numerator and the denominator evenly divisible by 5? Yes! So we reduce it:

 35 30
÷ 5 =
 7 6

So far so good... let's try to divide by that number again.

No good. So next you try the next prime number, which is 7...

No good. 7 is larger than 6. So we're done reducing.

And we're done! Here's the final answer to 8/12 + 5/10

 8 12
+
 5 10
=
 7 6