Rounding
Rounding decimals
Round decimals to the nearest tenth, hundredth or thousandth. Two groups add one then two extra decimal places, with exact answers that preserve the requested precision.
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Rounding money
Round amounts to the nearest one or ten units with dollar, pound, euro or yen symbols. Print two groups of increasingly large amounts, with two-decimal-place answers.
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Round every amount to the nearest one or ten units, as requested. At halfway, choose the greater amount. Write the answer with two decimal places and the selected currency symbol.
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Learning objective
What this activity builds
Estimate an amount at a chosen whole-unit precision and explain how the rounding unit affects the result.
Worked example
Round $99.66 to the nearest one unit, then to the nearest ten units.
$100.00 in both cases
99.66 is nearer to 100 than to 99, and nearer to 100 than to 90. Different rounding units sometimes produce the same result, but use different pairs of neighbors.
Teaching notes
Make the practice count
- Nearest-one practice uses two-digit amounts in the first group and three-digit amounts in the second. Nearest-ten practice moves to three and four digits.
- Changing the currency symbol preserves every amount and answer. This is useful when comparing the same arithmetic with familiar notation.
- All four symbol choices retain two decimal places, including yen. This exercise practices decimal rounding; it does not model local cash-payment denominations.
- Ask which precision is useful for an estimate before calculating. An estimate to ten units answers a different question from an estimate to one unit.
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A useful next step
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Round positive whole numbers to the nearest ten, hundred or thousand. Choose fixed or mixed digit ranges, 10, 20 or 30 questions, and a separate answer key.
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