Title: Lesson 8-5
Author: mark_cameron
Last saved by: MHE
Company: McGraw-Hill

Lesson 12-6

Example 1   Divide Integers
Divide −6 ÷ 3.

There are 3 groups of 2 negative counters.

Separate 6 negative counters 
into 3 equal-size groups. 	

So, −6 ÷ 3 = −2.

Example 2   Divide Integers
Divide 27 ÷ 3.

There are 3 groups of 9 positive counters.

Separate 27 positive counters 
into 3 equal-size groups.

So, 27 ÷ 3 = 9.

Example 3 Divide Integers
Find −21 ÷ 3.

negative quotient

Since −7 × 3 = −21, it follows that −21 ÷ 3 = −7.		

Example 4 Divide Integers
Find 42 ÷ (−7).

negative quotient

Since −6 × (−7) = 42, it follows that 42 ÷ (−7) = −6.		

Example 5 Divide Integers
Find −35 ÷ (−7).

positive quotient

Since 5 × (−7) = −35, it follows that −35 ÷ (−7) = 5.		

Example 6 Standardized Test Practice
MULTIPLE-CHOICE TEST ITEM   The temperature fell a total of 18 degrees in 
6 hours. If the temperature fell an equal amount each hour, which integer represents the change in temperature for each hour?

A   −6		B   −3		C   3		D   6

Read the Test Item
You need to find the number of degrees the temperature fell each hour. Represent the total drop in temperature using −18.

Solve the Test Item
Since −18 ÷ 6 = −3, the answer is B.