Compatible Numbers for Division

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What are compatible numbers?

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Compatible numbers are numbers that are easy to compute with mentally. They are often rounded numbers that make calculations simpler.

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What is the purpose of rounding numbers in division?

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Rounding numbers in division helps to estimate the quotient quickly and easily without performing exact calculations.

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CCSS.4.NBT.B.6

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The divisor is 76.

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CCSS.5.NBT.B.6

CCSS.6.NS.B.2

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80.

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Choose a compatible number for 90.

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1,800 is compatible with 90 because it can be easily divided by 90.

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CCSS.4.NBT.B.6

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70.

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CCSS.5.NBT.B.7

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You should change 53 to 50.

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CCSS.4.NBT.B.6

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How do you round 76 to the nearest ten?

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76 rounds up to 80 when rounding to the nearest ten.

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CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

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What is the compatible number for 90 that is closest to 1,800?

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1,800 is a compatible number for 90.

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CCSS.4.NBT.B.5