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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 120 · 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 196 + 702 + 395? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  2. 2.Which is closest to 495 + 404 + 595? (a) 1600 (b) 1700 (c) 1400 (d) 1500
  3. 3.Round 20512 to the nearest ten.
  4. 4.Which is closest to 601 + 601 + 296? (a) 1500 (b) 1400 (c) 1700 (d) 1600
  5. 5.Round 47.44 to one decimal place. =
  6. 6.Round 74.33 to one decimal place. =
  7. 7.Which is closest to 595 + 502 + 304? (a) 1500 (b) 1400 (c) 1300 (d) 1600
  8. 8.Which is closest to 602 × 38? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  9. 9.Which is closest to 497 × 68? (Round each number first.) (a) 3500 (b) 70000 (c) 350000 (d) 35000
  10. 10.Round 19175 to the nearest hundred.
  11. 11.Round 83857 to the nearest ten.
  12. 12.Round 94492 to the nearest hundred.
  13. 13.Which is closest to 1401 ÷ 21? (a) 700 (b) 140 (c) 35 (d) 70
  14. 14.Round 98899 to the nearest thousand.
  15. 15.Round 51981 to the nearest hundred.
  16. 16.Which is closest to 1796 ÷ 21? (a) 180 (b) 90 (c) 45 (d) 900
  17. 17.Which is closest to 2007 ÷ 51? (a) 40 (b) 400 (c) 80 (d) 20
  18. 18.Which is closest to 199 × 78? (Round each number first.) (a) 16000 (b) 1600 (c) 160000 (d) 32000
  19. 19.Which is closest to 599 × 50? (Round each number first.) (a) 3000 (b) 300000 (c) 30000 (d) 60000
  20. 20.Which is closest to 1200 ÷ 19? (a) 600 (b) 120 (c) 30 (d) 60
  21. 21.Round 42.49 to one decimal place. =
  22. 22.Round 79145 to the nearest thousand.
  23. 23.Round 96.84 to one decimal place. =
  24. 24.Which is closest to 796 + 400 + 695? (a) 1800 (b) 1900 (c) 2100 (d) 2000
  25. 25.Round 39785 to the nearest hundred.
  26. 26.Which is closest to 297 + 504 + 296? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  27. 27.Which is closest to 895 + 696 + 96? (a) 1800 (b) 1900 (c) 1600 (d) 1700
  28. 28.Round 60492 to the nearest hundred.
  29. 29.Which is closest to 502 + 604 + 305? (a) 1300 (b) 1600 (c) 1400 (d) 1500
  30. 30.Which is closest to 3007 ÷ 51? (a) 30 (b) 60 (c) 600 (d) 120
  31. 31.Which is closest to 703 × 70? (Round each number first.) (a) 98000 (b) 49000 (c) 490000 (d) 4900
  32. 32.Which is closest to 896 + 199 + 96? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  33. 33.Which is closest to 896 + 697 + 805? (a) 2300 (b) 2400 (c) 2500 (d) 2600
  34. 34.Which is closest to 296 + 501 + 198? (a) 1200 (b) 1100 (c) 1000 (d) 900
  35. 35.Round 42.57 to one decimal place. =
  36. 36.Round 22868 to the nearest ten.
  37. 37.Which is closest to 901 × 81? (Round each number first.) (a) 7200 (b) 720000 (c) 144000 (d) 72000
  38. 38.Which is closest to 1193 ÷ 21? (a) 60 (b) 600 (c) 120 (d) 30
  39. 39.Which is closest to 1799 ÷ 31? (a) 30 (b) 600 (c) 60 (d) 120
  40. 40.Round 41.81 to one decimal place. =

Answer key

  1. 1300
  2. 1500
  3. 20510
  4. 1500
  5. 47.4
  6. 74.3
  7. 1400
  8. 24000
  9. 35000
  10. 19200
  11. 83860
  12. 94500
  13. 70
  14. 99000
  15. 52000
  16. 90
  17. 40
  18. 16000
  19. 30000
  20. 60
  21. 42.5
  22. 79000
  23. 96.8
  24. 1900
  25. 39800
  26. 1100
  27. 1700
  28. 60500
  29. 1400
  30. 60
  31. 49000
  32. 1200
  33. 2400
  34. 1000
  35. 42.6
  36. 22870
  37. 72000
  38. 60
  39. 60
  40. 41.8

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