 # What is 7/9 + 6/12? 7 9
+
 6 12

## 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 12, and get 84, then we multiply 9 by 12 and get 108. Do the same for the second term. We multiply 6 by 9, and get 54, then multiply 9 by 12 and get 108. The problem now has new fractions to add:

 84 108
+
 54 108

## Step 2

Since our denominators match, we can add the numerators.

84 + 54 = 138

 138 108

## 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:

 138 108
÷ 2 =
 69 54

Now, try the same number again.

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

Are both the numerator and the denominator evenly divisible by 3? Yes! So we reduce it:

 69 54
÷ 3 =
 23 18

Now, try the same number again.

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...

Nope. Try the next prime number, 19...

No good. 19 is larger than 18. So we're done reducing.