Numbers/Multiplication and division of positive and negative whole numbers
< Numbers
This is a sub page for references to education material on multiplication and division of positive and negative whole numbers.
Multiplication and Division of Integers edit
Multiply divide the numbers as usual (disregarding it being positive or negative). Then define if the result is negative or posite using the following rules:
| +n | x | +n | = | +n |
| -n | x | -n | = | +n |
| +n | x | -n | = | -n |
| -n | x | +n | = | -n |
| +n | ÷ | +n | = | +n |
| -n | ÷ | -n | = | +n |
| +n | ÷ | -n | = | -n |
| -n | ÷ | +n | = | -n |
+n stands for a positive integer and -n for a negative integer.
There is also cheeky way to help you remember...
- If a good thing happens to a good person, you're happy (+ x + = +)
- If a bad thing happens to a good person, you're sad (- x + = -)
- If a bad thing happens to a bad person, you're happy (- x - = +)
- If a good thing happens to a bad person, your sad (+ x - = -)