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WAEC 2019 · Paper 1 · Q1

Express, correct to three significant figures, 0.003597.

Worked solution (try it first)
  1. The zeros after the point are not significant, so the first three significant figures are 3, 5 and 9.
  2. The next figure is 7, so round the 9 up.
  3. That makes 359 into 360, so the number is 0.00360.
  4. Keep the final zero to show three significant figures: 0.00360, option C.

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