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Adding and Subtracting Decimal Numbers Help

By — McGraw-Hill Professional
Updated on Sep 26, 2011

Adding and Subtracting Decimals

In order to add or subtract decimal numbers, each number needs to have the same number of digits behind the decimal point. If you write the problem vertically, you can avoid the common problem of adding the numbers incorrectly. For instance, 1.2 + 3.41 is not 4.43. The “2” needs to be added to the “4,” not to the “1.”

Examples

1.20 (Add as many zeros at the end as you need.)

Adding and Subtracting Decimal Numbers 2

Adding and Subtracting Decimals Practice Problems

Practice

Rewrite as a vertical problem and solve.

1. 7.26 + 18.1

2. 5 – 2.76

3. 15.01 – 6.328

4. 968.323 – 13.08

5. 28.56 – 16.7342

6. 0.446 + 1.2

7. 2.99 + 3

Solutions

Adding and Subtracting Decimal Numbers Solutions 4

Adding and Subtracting Decimal Numbers Solutions 6

Practice problems for this concept can be found at: Algebra Decimals Practice Test.

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