## Pre-Algebra Tutorial

*Multiplication of Real Numbers*

#### Intro

What are the rules for Multiplying Real Numbers?

1. Positive x Positive = Positive

2. Negative x Negative = Positive

3. Positive x Negative = Negative

4. Negative x Positive = Negative

These rules apply to all Real Numbers – Whole Numbers; Decimal Numbers; Fractions

#### Sample Problem

Example #1: Positive x Positive – Multiply: 25 x 6

Example #2: Negative x Negative – Multiply: -25 x (-6)

Example #3: Positive x Negative – Multiply: 25 x (-6)

Example #4: Negative x Positive – Multiply: -25 x 6

#### Solution

When Multiplying Real Numbers, there are 2 actions:

1. Multiply the numbers.

2. Determine the sign of the answer.

Example #1: Multiply: 25 x 6 = 150

Example #2: Multiply: -25 x (-6) = 150

Example #3: Multiply: 25 x (-6) = -150

Example #4: Multiply: -25 x 6 = -150

# About The Author

Developmental Math Instructor |

I have been teaching Developmental Mathematics at the local Community College/State College for 22 years. During this time, I have taught students of all ages and ability levels. I enjoy helping students to learn math concepts. Learning new math concepts extends the student's knowledge and th... |