Adding whole numbers means that we are combining numbers to form a total.

We call the total in addition the sum. The sum always means addition - it is the total of when numbers are added together.

Let's look at an example:

3 + 4 = 7 

The sum of 3 and 4 is 7. 

The sum is what comes after the equals sign in an addition question.  

Example

What is the sum of 13 and 3?

Answer

Start at 13 and count 3 forwards.

The sum of 13 and 3 is 16  

Let's have a go at some questions now.