Adding & Subtracting Decimals with Models

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What is a decimal?

Back

A decimal is a number that includes a decimal point, which separates the whole number part from the fractional part. For example, 0.5 is a decimal.

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CCSS.7.NS.A.2D

CCSS.8.NS.A.1

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How do you add decimals?

Back

To add decimals, align the decimal points and add as you would whole numbers. Place the decimal point in the answer directly below the other decimal points.

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CCSS.6.NS.B.3

Front

How do you subtract decimals?

Back

To subtract decimals, align the decimal points and subtract as you would whole numbers. Place the decimal point in the answer directly below the other decimal points.

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CCSS.5.NBT.B.7

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What does the term 'equivalent' mean in decimals?

Back

Equivalent decimals are different decimal representations of the same value, such as 0.5 and 0.50.

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CCSS.4.NF.C.7

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What is the value of 0.37 + 0.49?

Back

0.86

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CCSS.5.NBT.B.7

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What is the value of 0.32 + 0.17?

Back

0.49

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CCSS.5.NBT.B.7

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What is the value of 0.73 - 0.23?

Back

0.50

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CCSS.5.NBT.B.7

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What is the value of 0.7 + 0.44?

Back

1.14

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CCSS.5.NBT.B.7

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What is a model in math?

Back

A model in math is a visual representation of a mathematical concept, such as a number line or a hundreds grid.

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CCSS.2.MD.B.6

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How can a hundreds grid help in understanding decimals?

Back

A hundreds grid helps visualize the value of decimals by showing how many tenths and hundredths are represented.

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CCSS.5.NBT.A.2