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Adding and Subtracting Decimals NS 1.0 Solve problems involving addition and subtraction of decimals.

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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.

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Example 1 0.64 + 0.39 Line up the decimal points. 0.64 +0.39 __________________________ Add the columns. 0.64 +0.39 __________________________ 1.03

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Example 2 5.74 + 3.3 Line up the decimal points. 5.74 + 3.3 _____________________________ Add the columns. 5.74 + 3.3 _____________________________ 9.04

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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.

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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

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Practice Time

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