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Question 21

Four race times are 9.8, 9.75, 9.805 and 9.79 seconds. Which list orders them from fastest to slowest?

  1. 9.8, 9.75, 9.79, 9.805
  2. 9.75, 9.79, 9.8, 9.805Correct answer
  3. 9.805, 9.8, 9.79, 9.75
  4. 9.75, 9.8, 9.79, 9.805

Explanation

A faster time is smaller, and alignment gives 9.750 < 9.790 < 9.800 < 9.805. Putting 9.8 first because it has fewer written digits reverses the numerical comparison rather than ordering the times.

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Question 21: Four race times are 9.8, 9.75, 9.805 and 9.79 seconds.… · Decimals and Place Value · Questena