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Հարց 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, 9.805Ճիշտ պատասխան
  3. 9.805, 9.8, 9.79, 9.75
  4. 9.75, 9.8, 9.79, 9.805

Բացատրություն

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