### In this lesson:

- Introduction to numbers
- The Number Line
- Its use in addition

## Getting to Know Numbers

Every person is different and special, and it’s the same with numbers. Every number is special too, and when we get to know numbers they become as familiar as old friends.

When you think of number 2 you might think of *2 eyes*.

When you think of 7 you might think of the *7 colours of the rainbow*.

**Arithmetic** is the study of the behaviour of numbers.

Numbers start with *zero*.

Then comes number *one*, then *two*, then *three* and so on.

## Bigger Numbers

Of course numbers go on beyond 9, to 10, 11, 12 and so on. And there is no end.

**0 1 2 3 4 5 6 7 8 9 10 11 12 . . .**

So all numbers beyond 9 are made out of the basic numbers: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9.

## The Number Line

A good way to imagine numbers is on a straight line like this:

It’s called the **Number Line**.

And you can pick out a section of the line further on, like this:

This makes it easier to work with numbers, adding and subtracting them.

## Adding On

If you want to find 7 + 4 you can start at 7 and *count on* 4 from there. That brings you to 11. So 7 + 4 = 11.

You can use the number line to help with this if you wish, or you can just do it in your head.

## Key Points of this Lesson:

- Numbers are our friends
- Numbers are formed from the basic
*digits*0, 1, 2, 3, 4, 5, 6, 7, 8, 9 - The Number Line is useful to imagine numbers
- Numbers can be added by simply counting on from the first number