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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 693 · 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 1206 ÷ 21? (a) 120 (b) 600 (c) 60 (d) 30
  2. 2.Which is closest to 499 × 18? (Round each number first.) (a) 20000 (b) 1000 (c) 100000 (d) 10000
  3. 3.Which is closest to 305 + 297 + 900? (a) 1400 (b) 1500 (c) 1700 (d) 1600
  4. 4.Which is closest to 401 + 500 + 96? (a) 1100 (b) 1000 (c) 1200 (d) 900
  5. 5.Which is closest to 503 + 604 + 98? (a) 1400 (b) 1200 (c) 1100 (d) 1300
  6. 6.Which is closest to 298 × 19? (Round each number first.) (a) 12000 (b) 600 (c) 6000 (d) 60000
  7. 7.Which is closest to 598 × 91? (Round each number first.) (a) 540000 (b) 5400 (c) 54000 (d) 108000
  8. 8.Round 21198 to the nearest hundred.
  9. 9.Which is closest to 3495 ÷ 49? (a) 700 (b) 35 (c) 140 (d) 70
  10. 10.Which is closest to 398 × 68? (Round each number first.) (a) 2800 (b) 28000 (c) 280000 (d) 56000
  11. 11.Round 49322 to the nearest hundred.
  12. 12.Round 63.08 to one decimal place. =
  13. 13.Which is closest to 2994 ÷ 49? (a) 60 (b) 30 (c) 120 (d) 600
  14. 14.Round 53631 to the nearest ten.
  15. 15.Round 52.22 to one decimal place. =
  16. 16.Round 66.27 to one decimal place. =
  17. 17.Which is closest to 198 × 68? (Round each number first.) (a) 14000 (b) 1400 (c) 28000 (d) 140000
  18. 18.Round 49929 to the nearest thousand.
  19. 19.Which is closest to 396 + 395 + 303? (a) 1200 (b) 1100 (c) 1300 (d) 1000
  20. 20.Which is closest to 2507 ÷ 49? (a) 500 (b) 100 (c) 25 (d) 50
  21. 21.Round 49303 to the nearest ten.
  22. 22.Which is closest to 303 + 602 + 303? (a) 1200 (b) 1300 (c) 1400 (d) 1100
  23. 23.Round 25.67 to one decimal place. =
  24. 24.Which is closest to 199 + 98 + 503? (a) 900 (b) 1000 (c) 700 (d) 800
  25. 25.Which is closest to 1795 ÷ 31? (a) 60 (b) 30 (c) 120 (d) 600
  26. 26.Which is closest to 796 × 89? (Round each number first.) (a) 720000 (b) 144000 (c) 7200 (d) 72000
  27. 27.Round 21.61 to one decimal place. =
  28. 28.Which is closest to 797 + 203 + 301? (a) 1300 (b) 1500 (c) 1200 (d) 1400
  29. 29.Which is closest to 897 + 604 + 199? (a) 1700 (b) 1900 (c) 1600 (d) 1800
  30. 30.Which is closest to 3004 ÷ 51? (a) 60 (b) 30 (c) 120 (d) 600
  31. 31.Round 77323 to the nearest thousand.
  32. 32.Which is closest to 504 × 52? (Round each number first.) (a) 250000 (b) 50000 (c) 2500 (d) 25000
  33. 33.Round 21900 to the nearest thousand.
  34. 34.Round 41.94 to one decimal place. =
  35. 35.Round 9394 to the nearest hundred.
  36. 36.Round 61.11 to one decimal place. =
  37. 37.Round 46.39 to one decimal place. =
  38. 38.Which is closest to 198 + 496 + 199? (a) 800 (b) 1100 (c) 1000 (d) 900
  39. 39.Round 29.06 to one decimal place. =
  40. 40.Round 86078 to the nearest ten.

Answer key

  1. 60
  2. 10000
  3. 1500
  4. 1000
  5. 1200
  6. 6000
  7. 54000
  8. 21200
  9. 70
  10. 28000
  11. 49300
  12. 63.1
  13. 60
  14. 53630
  15. 52.2
  16. 66.3
  17. 14000
  18. 50000
  19. 1100
  20. 50
  21. 49300
  22. 1200
  23. 25.7
  24. 800
  25. 60
  26. 72000
  27. 21.6
  28. 1300
  29. 1700
  30. 60
  31. 77000
  32. 25000
  33. 22000
  34. 41.9
  35. 9400
  36. 61.1
  37. 46.4
  38. 900
  39. 29.1
  40. 86080

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