
Estimation
Estimating sums and differences
Estimate addition and subtraction with two-, three- or four-digit numbers. Choose rounding guides or horizontal practice, an optional worked example and a separate answer key.
Preview and downloadEstimation practice
Read original addition and subtraction stories, round the quantities to a stated place and give an estimated answer with its unit. Choose two-, three- or four-digit quantities.
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Read the question and identify the operation. Round each quantity to the requested place, calculate with the rounded numbers, and write an estimated answer with the correct unit.
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Customize this worksheetReady-made PDFs are in English and include Letter and A4 versions. The file with answers adds a separate key with the same question positions. The preview shows the first page; downloads include every page.
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Learning objective
Choose the operation described by a context and use rounded quantities to answer an explicitly approximate question.
Worked example
250 + 320 = 570, so about 570 books.
The question asks for an estimate. The exact total is 564 books, but the required method is to round the two deliveries separately before adding. Keep the unit books in the answer.
Teaching notes
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A useful next step

Estimation
Estimate addition and subtraction with two-, three- or four-digit numbers. Choose rounding guides or horizontal practice, an optional worked example and a separate answer key.
Preview and download
Rounding
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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Estimation
Round two- and three-digit factors, then estimate their product. Practice guided or horizontal multiplication, including mixed three-by-two-digit factors and nearest-hundred rounding.
Preview and download