 # What is 7/16 + 5/10? 7 16
+
 5 10

## Step 1

Of course, you can't add two fractions if the denominators (bottom numbers) don't match. To get a common denominator, multiply the denominators together. Then we fix the numerators by multiplying each one by their other term's denominator.

Now you multiply 7 by 10, and get 70, then we multiply 16 by 10 and get 160. Do the same for the second term. We multiply 5 by 16, and get 80, then multiply 16 by 10 and get 160. The problem now has new fractions to add:

 70 160
+
 80 160

## Step 2

Since our denominators match, we can add the numerators.

70 + 80 = 150

The sum we get is

 150 160

## Step 3

The last step is to reduce the fraction if we can.

To find out, we try dividing it by 2...

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

 150 160
÷ 2 =
 75 80

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:

 75 80
÷ 5 =
 15 16

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. So next you try the next prime number, which is 11...

No good. So next you try the next prime number, which is 13...

No good. So next you try the next prime number, which is 17...

No good. 17 is larger than 15. So we're done reducing.

And we're done! Here's the final answer to 7/16 + 5/10

 7 16
+
 5 10
=
 15 16