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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 678 · 40 questions
TalentJR

The method (Round, then calculate): Round each number to the nearest ten, hundred or whole number. Do the easy sum with the rounded numbers. Pick the option nearest to it. To round a number, look at the digit after the place you keep: 5 or more goes up, less than 5 stays.

NameDateTime takenScore ___ / 40
  1. 1.Which is closest to 795 ÷ 39? (a) 200 (b) 20 (c) 10 (d) 40
  2. 2.Which is closest to 300 × 62? (Round each number first.) (a) 180000 (b) 18000 (c) 1800 (d) 36000
  3. 3.Round 14.71 to one decimal place. =
  4. 4.Which is closest to 1202 ÷ 39? (a) 30 (b) 60 (c) 300 (d) 15
  5. 5.Round 34.83 to one decimal place. =
  6. 6.Round 12.72 to one decimal place. =
  7. 7.Round 17.32 to one decimal place. =
  8. 8.Which is closest to 204 × 49? (Round each number first.) (a) 10000 (b) 20000 (c) 1000 (d) 100000
  9. 9.Which is closest to 602 + 298 + 105? (a) 900 (b) 1100 (c) 1000 (d) 1200
  10. 10.Which is closest to 295 + 302 + 701? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  11. 11.Round 95.42 to one decimal place. =
  12. 12.Which is closest to 796 + 502 + 698? (a) 2000 (b) 2200 (c) 1900 (d) 2100
  13. 13.Round 13.88 to one decimal place. =
  14. 14.Which is closest to 402 ÷ 21? (a) 20 (b) 40 (c) 200 (d) 10
  15. 15.Round 75.56 to one decimal place. =
  16. 16.Which is closest to 497 × 31? (Round each number first.) (a) 1500 (b) 30000 (c) 15000 (d) 150000
  17. 17.Round 11747 to the nearest hundred.
  18. 18.Which is closest to 2807 ÷ 41? (a) 700 (b) 35 (c) 70 (d) 140
  19. 19.Round 21.09 to one decimal place. =
  20. 20.Which is closest to 303 × 32? (Round each number first.) (a) 90000 (b) 9000 (c) 18000 (d) 900
  21. 21.Which is closest to 602 × 38? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  22. 22.Which is closest to 904 + 499 + 98? (a) 1400 (b) 1600 (c) 1700 (d) 1500
  23. 23.Which is closest to 1501 ÷ 49? (a) 300 (b) 60 (c) 15 (d) 30
  24. 24.Round 55.94 to one decimal place. =
  25. 25.Which is closest to 196 + 402 + 97? (a) 900 (b) 800 (c) 600 (d) 700
  26. 26.Which is closest to 1000 ÷ 51? (a) 20 (b) 200 (c) 10 (d) 40
  27. 27.Which is closest to 304 × 29? (Round each number first.) (a) 18000 (b) 900 (c) 9000 (d) 90000
  28. 28.Round 67344 to the nearest ten.
  29. 29.Round 63282 to the nearest hundred.
  30. 30.Which is closest to 596 + 202 + 100? (a) 800 (b) 900 (c) 1100 (d) 1000
  31. 31.Round 27995 to the nearest thousand.
  32. 32.Which is closest to 604 + 799 + 200? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  33. 33.Which is closest to 597 + 98 + 199? (a) 800 (b) 1000 (c) 900 (d) 1100
  34. 34.Which is closest to 2406 ÷ 29? (a) 40 (b) 80 (c) 160 (d) 800
  35. 35.Round 53.66 to one decimal place. =
  36. 36.Round 28197 to the nearest hundred.
  37. 37.Round 78893 to the nearest hundred.
  38. 38.Round 88431 to the nearest thousand.
  39. 39.Round 1449 to the nearest ten.
  40. 40.Round 32575 to the nearest thousand.

Answer key

  1. 20
  2. 18000
  3. 14.7
  4. 30
  5. 34.8
  6. 12.7
  7. 17.3
  8. 10000
  9. 1000
  10. 1300
  11. 95.4
  12. 2000
  13. 13.9
  14. 20
  15. 75.6
  16. 15000
  17. 11700
  18. 70
  19. 21.1
  20. 9000
  21. 24000
  22. 1500
  23. 30
  24. 55.9
  25. 700
  26. 20
  27. 9000
  28. 67340
  29. 63300
  30. 900
  31. 28000
  32. 1600
  33. 900
  34. 80
  35. 53.7
  36. 28200
  37. 78900
  38. 88000
  39. 1450
  40. 33000

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