Rounding decimals/Estimating Products of decimals

Front

What is rounding?

Back

Rounding is the process of adjusting a number to make it simpler and easier to work with, while keeping its value close to what it was.

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CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

What does it mean to round to the nearest ten?

Back

Rounding to the nearest ten means finding the closest multiple of ten to a given number.

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CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

How do you round 11.9 to the nearest ten?

Back

11.9 rounds to 10 because it is closer to 10 than to 20.

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CCSS.5.NBT.A.4

Front

What is the rule for rounding up?

Back

If the digit to the right of the rounding place is 5 or greater, round up.

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CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

What is the rule for rounding down?

Back

If the digit to the right of the rounding place is less than 5, round down.

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CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

Estimate the product of 11.9 and 21 by rounding to the nearest ten.

Back

Estimate: 10 x 20 = 200.

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CCSS.5.NBT.B.7

Front

What does it mean to round to the nearest hundredth?

Back

Rounding to the nearest hundredth means adjusting a number to two decimal places.

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CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

How do you round 3.847 to the nearest hundredth?

Back

3.847 rounds to 3.85.

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CCSS.5.NBT.A.4

Front

What is the nearest one to 7.29?

Back

7.29 rounds to 7.

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CCSS.5.NBT.A.4

Front

What does it mean to round to the nearest tenth?

Back

Rounding to the nearest tenth means adjusting a number to one decimal place.

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CCSS.5.NBT.A.4