 # What is 1/10 + 1/11? 1 10
+
 1 11

## 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 1 by 11, and get 11, then we multiply 10 by 11 and get 110. Now for the second term. You multiply 1 by 10, and get 10, then multiply 10 by 11 and get 110. We now have a new problem, that looks like this:

 11 110
+
 10 110

## Step 2

Since our denominators match, we can add the numerators.

11 + 10 = 21

That gives us the sum, which is

 21 110

## Step 3

Now, do we need to simplify this fraction?

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

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...

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. 23 is larger than 21. So we're done reducing.

And we're done! Here's the final answer to 1/10 + 1/11

 1 10
+
 1 11
=
 21 110