Estimation to check answers to calculations
Use estimation to check answers to calculations and determine, in the context of a problem, an appropriate degree of accuracy
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Estimate products and quotients to detect unreasonable answers. Decide when an estimate is enough and when an exact answer is needed.
Estimate products and quotients to detect unreasonable answers. Decide when an estimate is enough and when an exact answer is needed.
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Check understanding
- Estimate 487 × 23 by rounding to 500 × 20 and use this to check a calculated answer
- Determine whether an exact answer or an estimate is more appropriate in a given context
- Spot an unreasonable answer by comparing with a quick mental estimate
“Before your child works out a large multiplication or division, can they estimate what the answer should be roughly — and then check whether their final answer is in the right ballpark?”
Curriculum record
- Type
- Meta
- Subject
- Mathematics
- Domain
- Multiplication & Division
- Age range
- Ages 10–11