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Question 102

Which calculation does NOT give the benchmark estimate of 40 for 7.9 × 5.2?

  1. 8 × 5
  2. 8 + 5Bonne réponse
  3. 16 × 2.5
  4. 4 × 10

Explication

Rounding the factors gives 8 × 5 = 40, and equivalent benchmark products such as 16 × 2.5 and 4 × 10 also equal 40. The calculation 8 + 5 = 13 adds the rounded values and therefore does not estimate the product.

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Question 102: Which calculation does NOT give the benchmark estimate of… · Decimals and Place Value · Questena