Rounding Decimal Numbers

What is the rule for rounding up?

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

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

• You always round up regardless of the digit to the right.

• You round up only if the digit to the right is 0.

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CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

What is rounding?

• Rounding is the process of adjusting the digits of a number to make it simpler while keeping its value close to what it was.

• Rounding is the method of increasing the value of a number to the nearest whole number.

• Rounding is the technique of decreasing the value of a number to the nearest ten.

• Rounding is the process of converting a number into a fraction.

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CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

Round $0.258 to the nearest hundredth.

• $0.25

• $0.26

• $0.27

• $0.30

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CCSS.5.NBT.A.4

Round 4.735 to the nearest whole number.

• 3

• 4

• 5

• 6

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CCSS.5.NBT.A.4

What is the rule for rounding down?

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

• If the digit to the right of the place value you are rounding to is 5 or greater, you round down.

• You always round down regardless of the digit to the right.

• You round down only if the digit to the right is 0.

Tags

CCSS.3.NBT.A.1

CCSS.4.NBT.A.3

What does it mean to round to the nearest hundredth?

• Rounding to the nearest hundredth means adjusting a number to two decimal places, looking at the third decimal place to decide whether to round up or down.

• Rounding to the nearest hundredth means adjusting a number to the nearest whole number.

• Rounding to the nearest hundredth means ignoring all decimal places after the second one.

• Rounding to the nearest hundredth means rounding down to the nearest ten.

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CCSS.5.NBT.A.4

What is the place value of the digit in the hundredths place?

• The hundredths place is the second digit to the right of the decimal point.

• The hundredths place is the first digit to the right of the decimal point.

• The hundredths place is the third digit to the right of the decimal point.

• The hundredths place is the digit immediately to the left of the decimal point.

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CCSS.5.NBT.A.3A

Round 18.194 to the nearest hundredth.

• 18.18

• 18.19

• 18.20

• 18.21

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CCSS.5.NBT.A.4

Why is rounding important in everyday life?

• Rounding helps simplify numbers, making them easier to work with in calculations, budgeting, and estimating.

• Rounding is used to make numbers larger for easier comparison.

• Rounding is primarily used in scientific calculations only.

• Rounding eliminates the need for any calculations at all.

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CCSS.5.NBT.A.4

What is the place value of the digit in the tenths place?

• The tenths place is the first digit to the right of the decimal point.

• The tenths place is the second digit to the right of the decimal point.

• The tenths place is the first digit to the left of the decimal point.

• The tenths place is the last digit in a whole number.

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CCSS.5.NBT.A.3A