# Integer numbers II

Let us see first how to subtract integer numbers. Take a look at the following example:
- 4 - 2 = - 6.
On a number axis we go from the number - 4 for two position to the left since we have - 2.
The same goes with the following example:

2 - 4 - 3 = - 5.
On a number axis we go from the number 2 for four positions to the left. We come to the number - 2. Next, we go from the number - 2 for three positions to the left. And, we come to our result - 5.

What happens when we take zero (0) into account. Take a look at the following:

0 - 5 = - 5.
For your exercise, try with the following:

-4 - 10 - 7 =

- 5 + 27 - 30 =

Multiplication of integer numbers

When we multiply integer numbers, the most important thing to remember is (we will call it "our rule"):
1. + times + is +,

2. + times - is - (- times +) is -,

3. - times - is -.

Now, let us see how our rule works. :)
Take a look at the following examples.

- 4 × 2 = 8

4 × (- 3) = - 12

- 5 × (- 4) = 20

To master multiplication of integer numbers, we need to see what happens with zero (0).

2 × 0 = 0

0 × (- 4) = 0

Here we can rememeber, let us call it "our rule one":

Every number multiplied by 0 gives 0.

Good luck! :)