Numbers/Multiplication and division of positive and negative whole numbers
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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 | edit source]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 - = -)