Adding and Subtracting Decimal Numbers

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What is the sum of 79.3 and 10.21?

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89.51

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CCSS.6.NS.B.3

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How do you read the number 8.097?

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Eight and ninety-seven thousandths.

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CCSS.5.NBT.A.3A

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What is the sum of 15.8 and 4.99?

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20.79

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CCSS.6.NS.B.3

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What is the difference of 17 and 1.2?

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15.8

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CCSS.5.NBT.B.7

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What is the total mass of two rocks weighing 41.4 grams and 74.3 grams?

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115.7 grams.

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CCSS.6.NS.B.3

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What is a decimal number?

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A number that includes a decimal point, representing a fraction of a whole.

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CCSS.3.NF.A.1

CCSS.3.NF.A.2B

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How do you align decimal numbers when adding or subtracting?

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Align the decimal points vertically.

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CCSS.5.NBT.B.7

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What is the value of the digit 5 in the number 3.45?

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0.05 (five hundredths).

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CCSS.5.NBT.A.3A

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What is the difference between hundredths and thousandths in decimal numbers?

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Hundredths are two places to the right of the decimal, while thousandths are three places to the right.

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CCSS.5.NBT.A.3A

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If you add 0.5 and 0.25, what is the result?

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0.75

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CCSS.5.NBT.B.7