Numbers below zero are called negative numbers. Numbers above zero are called whole numbers. There are rules you can use if adding, subtracting, multiplying or dividing positive and negative numbers.

The rule for multiplying and dividing is very similar to the rule for adding and subtracting.

- When the signs are different the answer is negative.
- When the signs are the same the answer is positive.

- Question
Calculate:

a)

b)

a) We have and . The signs are different, so the answer will be negative. So,

b) We have and . The signs are the same, so the answer will be positive. So,