Starting at 0 we can count up in 2s like this:

0 2 4 6 8 10 12 14 ...

But what happens before zero?

We have the negative numbers, counting in 2s, like this:

... -14 -12 -10 -8 -6 -4 -2 0

That was counting **UP**.

Now let's count **BACKWARDS in 2s **from **14**.

14 12 10 8 6 4 2 0 -2 -4 -6 -8 -10 -12 ...

**Example**

Count backwards in 2s to work out the missing number.

8 6 4 2 0 -2 _{} -6

What is the missing number?

**Answer**

Counting backwards in 2s from 0, it goes:

... 0 -2 **-4 ** -6

So the missing number is **-4**.