Download - Section 3.4
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Learning Target:Students will learn how to round decimals to a given place value.
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Using a number line to round:
You round a decimal by deciding which number it is closer to.
The same idea applies to the rounding rules.
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Rounding Rule:To round a decimal to a given
place value, look at the digit in the place to the right.
- If the digit is 4 or less, round down.
- If the digit is 5 or greater, round up.
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Use a number line / rounding rule to round the decimal as specified.
1. 1.3 (nearest one)
2. 3.86 (nearest tenth)
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Answers:
1. 1
2. 3.9
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Use a number line / rounding rule to round the decimal as specified.
1. 7.096 (nearest hundredth)
2. 3.9876 (nearest thousandth)
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Answers:
1. 7.10
2. 3.988
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When rounding small numbers we round to the leading digit to make the decimal easier to understand.
(1st nonzero digit as you read left to right)
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Round the decimal to the leading digit.
1. 0.058
2. 0.0091
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Answers:
1. 0.06
2. 0.009
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Round the decimal to the leading digit.
1. 0.0952
2. 0.006192
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Answers:
1. 0.1 or 0.10
2. 0.006
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Can you round decimals to a given place value?