Pre-Algebra Demystified

4. 2.5 or 2^12


5. 1.25 or 1^14

Operations with Positive and Negative

Decimals

When performing operations with decimals that are positive and negative,

perform the operations using the rules given in Chapter 2.

EXAMPLE

Add
8.23þ(
 0 :61).

SOLUTION


 8 : 23

þ
 0 : 61


 8 : 84

Recall that when two negative numbers are added, the answer is negative.

EXAMPLE

Multiply
3.62.01.

SOLUTION

2 : 01

 3 : 6

1206

603

7 : 236

Since a negative number times a positive number is negative, the answer


 7 :236.

PRACTICE

Perform the indicated operation:

1. 
   18.62þ3.25


2. 
   0.06
   1.4


3. 
   3.7(
   2 :95)

100 CHAPTER 5 Decimals