Compatible Numbers for Division

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What are compatible numbers?

Back

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

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How do you round a number to the nearest ten?

Back

To round a number to the nearest ten, look at the digit in the ones place. If it is 5 or more, round up. If it is 4 or less, round down.

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CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

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Back

The divisor is 76.

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CCSS.5.NBT.B.6

CCSS.6.NS.B.2

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Back

The result is 70.

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CCSS.5.NBT.B.6

CCSS.6.NS.B.2

Front

Which number is compatible with 4? 168, 170, 160, or 13?

Back

160 is compatible with 4.

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CCSS.4.NBT.B.6

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Which number is compatible with 90? 950, 1800, 820, or 19?

Back

1800 is compatible with 90.

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CCSS.7.NS.A.2C

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Back

The result is 6.

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CCSS.5.NBT.B.6

CCSS.6.NS.B.2

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Why are compatible numbers useful in division?

Back

They simplify calculations, making it easier to estimate and check answers.

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CCSS.4.NBT.B.6

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What is the nearest ten to 76?

Back

The nearest ten to 76 is 80.

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CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

How do you find compatible numbers for division?

Back

Look for numbers that are close to the original numbers and easy to divide.

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CCSS.4.NBT.B.6