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# Adding and Subtracting Decimals - PowerPoint PPT Presentation

Adding and Subtracting Decimals. NS 1.0 Solve problems involving addition and subtraction of decimals. To add decimals. Line up the decimal points and add the columns from right to left. Place a decimal point in the answer directly below the other decimal points. Example 1. 0.64 + 0.39

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Presentation Transcript

NS 1.0 Solve problems involving addition and subtraction of decimals.

• Line up the decimal points and add the columns from right to left.
• Place a decimal point in the answer directly below the other decimal points.
Example 1

0.64 + 0.39

Line up the decimal points.

0.64

+ 0.39

__________________________

0.64

+ 0.39

__________________________

1.03

Example 2

5.74 + 3.3

Line up the decimal points.

5.74

+ 3.3

_____________________________

5.74

+ 3.3

_____________________________

9.04

To subtract decimals
• Line up the decimal points.
• Subtract the columns from right to left, regrouping if necessary.
• Place a decimal point in the answer directly below the other decimal points.
Example 1

0.86 – 0.49

Line up the decimal points

0.86

- 0.49

__________________________

Regroup the tenths. Subtract the columns.

0.86

- 0.49

__________________________

16

7

0.37