 # What is 3/8 + 6/9? 3 8
+
 6 9

## 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 3 by 9, and get 27, then we multiply 8 by 9 and get 72. Do the same for the second term. We multiply 6 by 8, and get 48, then multiply 8 by 9 and get 72. The problem now has new fractions to add:

 27 72
+
 48 72

## Step 2

Since our denominators match, we can add the numerators.

27 + 48 = 75

 75 72

## Step 3

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

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

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

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

 75 72
÷ 3 =
 25 24

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 5...

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. So next you try the next prime number, which is 19...

No good. So next you try the next prime number, which is 23...

No good. So next you try the next prime number, which is 29...

No good. 29 is larger than 25. So we're done reducing.

And we're done! Here's the final answer to 3/8 + 6/9

 3 8
+
 6 9
=
 25 24