Exam-style question
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A calculation gives 0.072 for 6.9 × 10.4. Which check is most useful?.
- A.Estimate 7 × 10, which is about 70.
- B.Estimate 7 ÷ 10, which is about 0.7.
- C.Estimate 0.7 × 0.1, which is about 0.07.
- D.No estimate is possible because a calculator was used.
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- Topic focus: Measures and accuracy.
- Question style: practice.
- Reasoning demand: application.
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