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Problem-Solving and Data AnalysisEasyUnit conversion

Problem-Solving and Data Analysis practice question

A runner covers 3 kilometers. Given that 1 kilometer equals 1000 meters, how many meters is this?

  1. A. 30 meters
  2. B. 300 meters
  3. C. 3000 metersCorrect
  4. D. 30000 meters

Answer: C. 3000 meters

Multiply by the conversion factor: 3 km × 1000 m/km = 3000 m. The trap is miscounting zeros; track units so 'km' cancels and 'm' remains.

Why the other answers are wrong

A. 30 meters
You multiplied by 10 instead of 1000 — that's two zeros short.
B. 300 meters
You multiplied by 100 instead of 1000; there are three zeros in 1000 meters.
D. 30000 meters
You multiplied by 10,000 — one zero too many. 3 × 1000 = 3000.

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