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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 10 · 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 898 × 59? (Round each number first.) (a) 540000 (b) 54000 (c) 5400 (d) 108000
  2. 2.Which is closest to 3000 ÷ 49? (a) 600 (b) 60 (c) 30 (d) 120
  3. 3.Which is closest to 201 × 41? (Round each number first.) (a) 80000 (b) 800 (c) 8000 (d) 16000
  4. 4.Which is closest to 1494 ÷ 31? (a) 500 (b) 50 (c) 25 (d) 100
  5. 5.Which is closest to 698 × 28? (Round each number first.) (a) 2100 (b) 210000 (c) 21000 (d) 42000
  6. 6.Which is closest to 1199 ÷ 19? (a) 60 (b) 600 (c) 120 (d) 30
  7. 7.Which is closest to 602 ÷ 31? (a) 40 (b) 20 (c) 200 (d) 10
  8. 8.Which is closest to 299 × 50? (Round each number first.) (a) 30000 (b) 15000 (c) 150000 (d) 1500
  9. 9.Which is closest to 1194 ÷ 21? (a) 120 (b) 60 (c) 30 (d) 600
  10. 10.Which is closest to 903 × 48? (Round each number first.) (a) 450000 (b) 90000 (c) 4500 (d) 45000
  11. 11.Which is closest to 102 + 900 + 600? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  12. 12.Which is closest to 1194 ÷ 19? (a) 60 (b) 30 (c) 120 (d) 600
  13. 13.Which is closest to 1597 ÷ 39? (a) 80 (b) 40 (c) 400 (d) 20
  14. 14.Round 27.52 to one decimal place. =
  15. 15.Round 10.43 to one decimal place. =
  16. 16.Which is closest to 800 × 38? (Round each number first.) (a) 320000 (b) 64000 (c) 3200 (d) 32000
  17. 17.Round 21.38 to one decimal place. =
  18. 18.Which is closest to 605 + 799 + 302? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  19. 19.Round 81027 to the nearest hundred.
  20. 20.Round 75.69 to one decimal place. =
  21. 21.Round 86711 to the nearest hundred.
  22. 22.Which is closest to 3491 ÷ 49? (a) 700 (b) 70 (c) 140 (d) 35
  23. 23.Which is closest to 297 × 62? (Round each number first.) (a) 180000 (b) 36000 (c) 1800 (d) 18000
  24. 24.Round 54352 to the nearest ten.
  25. 25.Which is closest to 604 × 20? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000
  26. 26.Which is closest to 600 + 902 + 801? (a) 2400 (b) 2300 (c) 2500 (d) 2200
  27. 27.Which is closest to 104 + 405 + 705? (a) 1200 (b) 1300 (c) 1400 (d) 1100
  28. 28.Round 95.53 to one decimal place. =
  29. 29.Round 92124 to the nearest hundred.
  30. 30.Which is closest to 295 + 404 + 305? (a) 900 (b) 1100 (c) 1000 (d) 1200
  31. 31.Round 30.47 to one decimal place. =
  32. 32.Round 30498 to the nearest ten.
  33. 33.Which is closest to 498 + 395 + 599? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  34. 34.Which is closest to 297 × 40? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  35. 35.Which is closest to 296 + 800 + 298? (a) 1300 (b) 1400 (c) 1500 (d) 1600
  36. 36.Which is closest to 199 + 98 + 695? (a) 900 (b) 1200 (c) 1100 (d) 1000
  37. 37.Which is closest to 801 + 305 + 105? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  38. 38.Round 78.93 to one decimal place. =
  39. 39.Which is closest to 704 × 51? (Round each number first.) (a) 3500 (b) 35000 (c) 350000 (d) 70000
  40. 40.Round 44.41 to one decimal place. =

Answer key

  1. 54000
  2. 60
  3. 8000
  4. 50
  5. 21000
  6. 60
  7. 20
  8. 15000
  9. 60
  10. 45000
  11. 1600
  12. 60
  13. 40
  14. 27.5
  15. 10.4
  16. 32000
  17. 21.4
  18. 1700
  19. 81000
  20. 75.7
  21. 86700
  22. 70
  23. 18000
  24. 54350
  25. 12000
  26. 2300
  27. 1200
  28. 95.5
  29. 92100
  30. 1000
  31. 30.5
  32. 30500
  33. 1500
  34. 12000
  35. 1400
  36. 1000
  37. 1200
  38. 78.9
  39. 35000
  40. 44.4

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