Integer Rules - El Paso Community College printable pdf download

Integer Rules - El Paso Community College

Integer Rules

El Paso Community College - Tutorial Services - Mission del Paso Campus

Addition & Subtraction Rules

1. If the signs are the same, add the numbers and keep the sign.

−7 − 8 = −15

7 + 8 = 15

If the signs are different subtract, and take the sign of the larger number.

‐7 + 8 = 1 or 7 – 8 = − 1

Use addition and Subtraction Rules when you “combine like terms”

Multiplication & Division Rules

Multiplication

Division

Negative X Negative = positive

Negative ÷ Negative = Positive

− 6 x −3 = 18 − 6 ÷ − 2 = 3

Negative X Positive = Negative

Negative ÷ Positive = Negative

−3 x 6 = −18 6 ÷ −2 = −3

Positive x Positive = Positive

Positive ÷ Positive = Positive

6 x 3 = 18 6 ÷ 2 = 3

Parenthesis can be used to indicate “Multiplication”

  (

Example 1: Double Negative Rule

The two negatives are “multiplying” and negative x negative = positive

 

 

Example 2: Sign Parenthesis Sign

(

The positive and the negative are multiplying, and negative x positive = negative

Saved: EPCC (Math Emporium) HANDOUT Integer Rules

Integer Rules - El Paso Community College