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Rounding Numbers

With all these rounding methods, you need to identify the last digit — e.g. if you're rounding 23.41 to 1 decimal place, the last digit is 4. Then look at the next digit to the right. If it's 5 or more you round up, if it's 4 or less you round down.

Q1)

Round these numbers to the required number of decimal places:
  1. 62.1935 (1 d.p.) 999✓
  2. 62.1935 (2 d.p.) _________
  3. 62.1935 (3 d.p.) _________
  4. 19.624328 (5 d.p.) _________
  5. 6.2999 (3 d.p.) _________
  6. π (3 d.p.) _________

Q2)

Round these numbers to the required number of significant figures.
  1. 1329.62 (3 s.f.) _________
  2. 1329.62 (4 s.f.) _________
  3. 1329.62 (5 s.f.) _________
  4. 120 (1 s.f.) _________
  5. 0.024687 (1 s.f.) _________
  6. 0.024687 (4 s.f.) _________
Remember - the first significant figure is the first digit which isn't zero.

Q3)

K = 456.9873 Write K correct to:
  1. one decimal place 999✓
  2. two decimal places _________
  3. three decimal places _________
  4. three significant figures _________
  5. two significant figures _________
  6. one significant figure. _________

Q4)

Write your answer to two decimal places.
  1. Calculate the square root of 8. _________

Q5)

Calculate, giving your answers to a sensible degree of accuracy:
  1. (42.65 × 0.9863) / (24.6 × 2.43) _________
  2. (13.63 + 7.22) / (13.63 — 7.22) _________

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