Rounding

Front

What is rounding in mathematics?

Back

Rounding is the process of adjusting the digits of a number to make it simpler while keeping its value close to what it was. It often involves increasing or decreasing the number to the nearest specified place value.

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CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

What does it mean to round to the nearest TENS?

Back

Rounding to the nearest TENS means adjusting a number to the closest multiple of ten. If the digit in the ones place is 5 or greater, the tens digit is increased by one; if it is less than 5, the tens digit remains the same.

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CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

What is the result of rounding 73 to the nearest TENS?

Back

70

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Front

How do you round the number 412 to the nearest TENS?

Back

You look at the ones place (2). Since it is less than 5, you round down to 410.

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CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

What does it mean to round to the nearest HUNDREDS?

Back

Rounding to the nearest HUNDREDS means adjusting a number to the closest multiple of one hundred. If the digit in the tens place is 5 or greater, the hundreds digit is increased by one; if it is less than 5, the hundreds digit remains the same.

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CCSS.3.NBT.A.1

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Front

What is the result of rounding 921 to the nearest HUNDREDS?

Back

900

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Front

Which number does NOT round to 400 when rounding to the nearest HUNDREDS?

Back

345 does NOT round to 400; it rounds to 300.

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CCSS.3.NBT.A.1

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Front

What is the result of rounding 669 to the nearest TENS?

Back

670

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Front

What is the general rule for rounding numbers?

Back

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

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CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Front

How do you determine which multiple of ten a number rounds to?

Back

Identify the digit in the ones place. If it is 5 or more, round up to the next ten; if it is less than 5, round down to the previous ten.

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CCSS.3.NBT.A.1

CCSS.4.NBT.A.3