## Pre-Algebra Tutorial

*Tackling negative numbers*

#### Intro

A positive number multiplied by a negative number equals a negative number. A negative number multiplied by a negative number equals a positive number, so what’s a positive number multiplied by a negative number that’s then multiplied by another negative number? A positive number! Negative numbers could be pesky little things. But if you remember that **two negatives** make a **positive** and a **negative** multiplied by a **positive number** equals a **negative numbe**r, you’ll be able to tackle any math problem with negative numbers.

#### Sample Problem

Multiply: 2(-2)(−5)

#### Solution

Multiply: 2(-2)(-5)

**First multiply two numbers, could be any two numbers. I chose 2 and -2 which equals -4 because a positive number multiplied by a negative number equals a negative number. **

-4(-5)

Then multiply the remaining numbers, which are two negative numbers. **A negative number multiplied by a negative number equals a positive number**, so the answer equals 20.

20

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Critical Reader, Math Expert |

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