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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 540 · 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 298 × 40? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  2. 2.Which is closest to 901 ÷ 29? (a) 300 (b) 30 (c) 60 (d) 15
  3. 3.Which is closest to 1591 ÷ 21? (a) 40 (b) 80 (c) 800 (d) 160
  4. 4.Which is closest to 2391 ÷ 41? (a) 120 (b) 600 (c) 60 (d) 30
  5. 5.Which is closest to 1402 ÷ 21? (a) 700 (b) 70 (c) 35 (d) 140
  6. 6.Which is closest to 295 + 105 + 105? (a) 400 (b) 500 (c) 600 (d) 700
  7. 7.Round 24705 to the nearest thousand.
  8. 8.Which is closest to 303 + 795 + 598? (a) 1800 (b) 1900 (c) 1600 (d) 1700
  9. 9.Which is closest to 896 × 31? (Round each number first.) (a) 270000 (b) 54000 (c) 27000 (d) 2700
  10. 10.Round 39693 to the nearest ten.
  11. 11.Which is closest to 798 × 32? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
  12. 12.Round 94.22 to one decimal place. =
  13. 13.Which is closest to 1509 ÷ 29? (a) 50 (b) 500 (c) 100 (d) 25
  14. 14.Which is closest to 799 × 50? (Round each number first.) (a) 400000 (b) 4000 (c) 40000 (d) 80000
  15. 15.Which is closest to 703 × 69? (Round each number first.) (a) 98000 (b) 4900 (c) 490000 (d) 49000
  16. 16.Which is closest to 203 + 902 + 405? (a) 1700 (b) 1500 (c) 1600 (d) 1400
  17. 17.Which is closest to 402 × 28? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  18. 18.Which is closest to 600 + 396 + 597? (a) 1500 (b) 1600 (c) 1700 (d) 1800
  19. 19.Which is closest to 898 × 71? (Round each number first.) (a) 126000 (b) 6300 (c) 63000 (d) 630000
  20. 20.Which is closest to 896 + 397 + 695? (a) 2100 (b) 2000 (c) 2200 (d) 1900
  21. 21.Which is closest to 906 ÷ 31? (a) 15 (b) 60 (c) 300 (d) 30
  22. 22.Which is closest to 901 + 702 + 695? (a) 2200 (b) 2400 (c) 2300 (d) 2500
  23. 23.Round 20.62 to one decimal place. =
  24. 24.Which is closest to 298 × 31? (Round each number first.) (a) 90000 (b) 18000 (c) 9000 (d) 900
  25. 25.Which is closest to 400 × 32? (Round each number first.) (a) 24000 (b) 12000 (c) 1200 (d) 120000
  26. 26.Which is closest to 895 + 305 + 300? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  27. 27.Which is closest to 597 ÷ 29? (a) 10 (b) 200 (c) 20 (d) 40
  28. 28.Which is closest to 4508 ÷ 49? (a) 180 (b) 45 (c) 900 (d) 90
  29. 29.Round 42.67 to one decimal place. =
  30. 30.Round 75.47 to one decimal place. =
  31. 31.Round 84.51 to one decimal place. =
  32. 32.Round 62.73 to one decimal place. =
  33. 33.Which is closest to 603 + 703 + 297? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  34. 34.Which is closest to 3005 ÷ 51? (a) 60 (b) 120 (c) 30 (d) 600
  35. 35.Round 17.56 to one decimal place. =
  36. 36.Which is closest to 101 + 796 + 597? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  37. 37.Which is closest to 601 × 60? (Round each number first.) (a) 36000 (b) 360000 (c) 3600 (d) 72000
  38. 38.Which is closest to 205 + 598 + 203? (a) 900 (b) 1100 (c) 1200 (d) 1000
  39. 39.Which is closest to 505 + 304 + 301? (a) 1100 (b) 1000 (c) 1300 (d) 1200
  40. 40.Which is closest to 603 × 40? (Round each number first.) (a) 24000 (b) 2400 (c) 48000 (d) 240000

Answer key

  1. 12000
  2. 30
  3. 80
  4. 60
  5. 70
  6. 500
  7. 25000
  8. 1700
  9. 27000
  10. 39690
  11. 24000
  12. 94.2
  13. 50
  14. 40000
  15. 49000
  16. 1500
  17. 12000
  18. 1600
  19. 63000
  20. 2000
  21. 30
  22. 2300
  23. 20.6
  24. 9000
  25. 12000
  26. 1500
  27. 20
  28. 90
  29. 42.7
  30. 75.5
  31. 84.5
  32. 62.7
  33. 1600
  34. 60
  35. 17.6
  36. 1500
  37. 36000
  38. 1000
  39. 1100
  40. 24000

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