Addition 
An operation joining two or more sets where the result is the whole. When adding we use the plus sign '+'.
Commutative property 
The order in which two numbers are added does not affect the results. The commutative property does not apply to subtraction.
Number line 
A line that shows numbers ordered by magnitude from left to right or bottom to top; equal intervals are marked and labelled.
'...where the result is the whole.'
Adding is the most basic of operations, or at least the easiest to understand. "I have two apples. I get three more. How many apples do I have now?"
As with multiplication, addition shows the commutative property. In other words, if I started with three apples and got two more, I will still have five. See this for yourself with our first sample Year 2 addition exercise.
It often helps to use a number line to add. This is useful when we add negative numbers, which is the same as subtracting. You can show this as a series of right- and left-ward jumps on a number line.
Things get a lot more complicated when we need to add fractions. The sample lessons should help clarify things for you.
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