# How can partitioning help me add two digit numbers?

## How can I add two-digit numbers?

Adding two digit numbers can be tricky.

You can make it easier by splitting each number into tens and units.

Splitting numbers apart like this is called **partitioning**.

### Example

**21 + 45 = ?**

**21** is the same as **20 + 1**

**45** is the same as **40 + 5**

So **21 + 45** can be written as **20 + 1 + 40 + 5**

Try adding the tens first **20 + 40 = 60**

Then add the units **1 + 5 = 6**

Then add these together **60 + 6 = 66**

Was that easier?