Operations with Positive and Negative Decimals
When performing operations with decimals that are positive and negative, perform the operations using the rules given in Addition and Subtraction.
Examples
Example 1
Add –8.23 + (-0.61).
Solution 1
Recall that when two negative numbers are added, the answer is negative.
Example 2
Multiply –3.6 × 2.01.
Solution 2
Since a negative number times a positive number is negative, the answer –7.236.
Operations with Positive and Negative Decimals Practice Problems
Practice
Perform the indicated operation:
1. –18.62 + 3.25
2. –0.06 – 1.4
3. –3.7 × (–2.95)
4. –18.27 – (–3.5)
5. 4.5 – 10.95
Answers
1. –15.37
2. –1.46
3. 10.915
4. –14.77
5. –6.45
Practice problems for these concepts can be found at: Decimals Practice Test.
Excerpted From:
From Pre-Algebra Demystified: A Self-Teaching Guide. Copyright © 2004 by The McGraw-Hill Companies, Inc. All Rights Reserved.
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