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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 521 · 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 595 + 702 + 597? (a) 1900 (b) 2100 (c) 2000 (d) 1800
  2. 2.Round 49.88 to one decimal place. =
  3. 3.Round 43.38 to one decimal place. =
  4. 4.Which is closest to 204 × 71? (Round each number first.) (a) 28000 (b) 1400 (c) 14000 (d) 140000
  5. 5.Which is closest to 2009 ÷ 49? (a) 40 (b) 400 (c) 20 (d) 80
  6. 6.Which is closest to 499 × 71? (Round each number first.) (a) 350000 (b) 35000 (c) 70000 (d) 3500
  7. 7.Round 27.78 to one decimal place. =
  8. 8.Which is closest to 3991 ÷ 49? (a) 800 (b) 40 (c) 80 (d) 160
  9. 9.Which is closest to 2500 ÷ 51? (a) 25 (b) 50 (c) 100 (d) 500
  10. 10.Which is closest to 993 ÷ 51? (a) 20 (b) 10 (c) 200 (d) 40
  11. 11.Round 58648 to the nearest thousand.
  12. 12.Which is closest to 196 × 81? (Round each number first.) (a) 32000 (b) 1600 (c) 160000 (d) 16000
  13. 13.Round 8329 to the nearest ten.
  14. 14.Which is closest to 297 × 60? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  15. 15.Which is closest to 903 + 96 + 198? (a) 1100 (b) 1300 (c) 1200 (d) 1400
  16. 16.Which is closest to 3192 ÷ 39? (a) 40 (b) 80 (c) 800 (d) 160
  17. 17.Round 93.63 to one decimal place. =
  18. 18.Which is closest to 499 × 30? (Round each number first.) (a) 150000 (b) 15000 (c) 1500 (d) 30000
  19. 19.Round 40.82 to one decimal place. =
  20. 20.Which is closest to 595 + 504 + 296? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  21. 21.Which is closest to 496 × 72? (Round each number first.) (a) 3500 (b) 70000 (c) 35000 (d) 350000
  22. 22.Round 75513 to the nearest hundred.
  23. 23.Round 93.73 to one decimal place. =
  24. 24.Which is closest to 299 × 89? (Round each number first.) (a) 270000 (b) 2700 (c) 27000 (d) 54000
  25. 25.Which is closest to 297 × 39? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000
  26. 26.Round 71252 to the nearest hundred.
  27. 27.Round 82.18 to one decimal place. =
  28. 28.Round 82.33 to one decimal place. =
  29. 29.Which is closest to 499 × 20? (Round each number first.) (a) 100000 (b) 10000 (c) 1000 (d) 20000
  30. 30.Round 27931 to the nearest ten.
  31. 31.Round 76038 to the nearest thousand.
  32. 32.Which is closest to 3492 ÷ 51? (a) 700 (b) 140 (c) 35 (d) 70
  33. 33.Round 43.08 to one decimal place. =
  34. 34.Which is closest to 4509 ÷ 51? (a) 900 (b) 180 (c) 45 (d) 90
  35. 35.Round 81423 to the nearest ten.
  36. 36.Which is closest to 1795 ÷ 21? (a) 180 (b) 90 (c) 900 (d) 45
  37. 37.Round 57399 to the nearest hundred.
  38. 38.Which is closest to 701 + 497 + 905? (a) 2100 (b) 2200 (c) 2300 (d) 2000
  39. 39.Which is closest to 297 + 405 + 205? (a) 900 (b) 800 (c) 1100 (d) 1000
  40. 40.Which is closest to 2699 ÷ 31? (a) 90 (b) 900 (c) 45 (d) 180

Answer key

  1. 1900
  2. 49.9
  3. 43.4
  4. 14000
  5. 40
  6. 35000
  7. 27.8
  8. 80
  9. 50
  10. 20
  11. 59000
  12. 16000
  13. 8330
  14. 18000
  15. 1200
  16. 80
  17. 93.6
  18. 15000
  19. 40.8
  20. 1400
  21. 35000
  22. 75500
  23. 93.7
  24. 27000
  25. 12000
  26. 71300
  27. 82.2
  28. 82.3
  29. 10000
  30. 27930
  31. 76000
  32. 70
  33. 43.1
  34. 90
  35. 81420
  36. 90
  37. 57400
  38. 2100
  39. 900
  40. 90

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