Pre-Algebra Demystified

EXAMPLE

Divideð
 18 Þð
 2 Þ.

SOLUTION

Divide 18 2 ¼9. Since both integers are negative, give the answer aþsign.

Hence,ð
 18 Þð
 2 Þ¼þ9.

Rule 2: To divide two integers with unlike signs, divide the absolute values of

the integers and give the answer a
sign.

EXAMPLE

Divideð
 30 Þ(þ5).

SOLUTION

Divide 30 5 ¼6. Since the numbers have unlike signs, give the answer a


sign. Hence,ð
 30 Þ(þ5)¼
6.

EXAMPLE

Divide (þ15)ð
 5 Þ.

SOLUTION

Divide 15 5 ¼3. Since the numbers have unlike signs, give the answer a


sign. Hence, (þ15)ð
 5 Þ¼
3.

PRACTICE

Divide:

1. ð
   63 Þð
   9 Þ


2. (þ45)(þ5)


3. (þ38)ð
   2 Þ


4. ð
   20 Þ(þ10)


5. ð
   30 Þð
   5 Þ

ANSWERS

1. þ 7


2. þ 9


3. 
   19


4. 
   2


5. þ 6

30 CHAPTER 2 Integers