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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 968 · 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 501 × 40? (Round each number first.) (a) 200000 (b) 40000 (c) 2000 (d) 20000
  2. 2.Which is closest to 1595 ÷ 39? (a) 20 (b) 40 (c) 80 (d) 400
  3. 3.Which is closest to 804 × 61? (Round each number first.) (a) 48000 (b) 96000 (c) 4800 (d) 480000
  4. 4.Round 74.43 to one decimal place. =
  5. 5.Which is closest to 600 + 103 + 100? (a) 1000 (b) 800 (c) 700 (d) 900
  6. 6.Round 11.31 to one decimal place. =
  7. 7.Which is closest to 1200 ÷ 19? (a) 120 (b) 600 (c) 60 (d) 30
  8. 8.Which is closest to 1397 ÷ 19? (a) 700 (b) 35 (c) 70 (d) 140
  9. 9.Which is closest to 3193 ÷ 41? (a) 40 (b) 80 (c) 800 (d) 160
  10. 10.Round 66581 to the nearest thousand.
  11. 11.Which is closest to 3504 ÷ 49? (a) 35 (b) 140 (c) 70 (d) 700
  12. 12.Which is closest to 497 + 303 + 495? (a) 1400 (b) 1500 (c) 1300 (d) 1200
  13. 13.Which is closest to 104 + 498 + 499? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  14. 14.Which is closest to 896 × 58? (Round each number first.) (a) 54000 (b) 108000 (c) 540000 (d) 5400
  15. 15.Round 14698 to the nearest ten.
  16. 16.Which is closest to 1199 ÷ 19? (a) 60 (b) 120 (c) 30 (d) 600
  17. 17.Which is closest to 896 ÷ 29? (a) 30 (b) 60 (c) 300 (d) 15
  18. 18.Which is closest to 200 + 603 + 98? (a) 1100 (b) 800 (c) 900 (d) 1000
  19. 19.Which is closest to 397 × 32? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  20. 20.Round 71.89 to one decimal place. =
  21. 21.Which is closest to 902 × 91? (Round each number first.) (a) 8100 (b) 162000 (c) 810000 (d) 81000
  22. 22.Round 65.19 to one decimal place. =
  23. 23.Which is closest to 808 ÷ 21? (a) 20 (b) 40 (c) 80 (d) 400
  24. 24.Which is closest to 100 + 700 + 802? (a) 1800 (b) 1700 (c) 1600 (d) 1500
  25. 25.Which is closest to 798 × 88? (Round each number first.) (a) 7200 (b) 144000 (c) 72000 (d) 720000
  26. 26.Which is closest to 201 × 32? (Round each number first.) (a) 600 (b) 12000 (c) 60000 (d) 6000
  27. 27.Round 95.41 to one decimal place. =
  28. 28.Which is closest to 1800 ÷ 31? (a) 120 (b) 600 (c) 60 (d) 30
  29. 29.Which is closest to 199 × 21? (Round each number first.) (a) 8000 (b) 40000 (c) 4000 (d) 400
  30. 30.Which is closest to 1200 ÷ 31? (a) 40 (b) 20 (c) 80 (d) 400
  31. 31.Which is closest to 3504 ÷ 51? (a) 70 (b) 140 (c) 35 (d) 700
  32. 32.Which is closest to 1509 ÷ 29? (a) 25 (b) 100 (c) 50 (d) 500
  33. 33.Which is closest to 397 × 88? (Round each number first.) (a) 72000 (b) 3600 (c) 36000 (d) 360000
  34. 34.Which is closest to 396 × 41? (Round each number first.) (a) 160000 (b) 32000 (c) 16000 (d) 1600
  35. 35.Which is closest to 295 + 703 + 803? (a) 2000 (b) 1900 (c) 1800 (d) 1700
  36. 36.Which is closest to 300 + 400 + 296? (a) 1200 (b) 900 (c) 1100 (d) 1000
  37. 37.Which is closest to 799 ÷ 41? (a) 20 (b) 10 (c) 200 (d) 40
  38. 38.Which is closest to 396 × 82? (Round each number first.) (a) 3200 (b) 320000 (c) 64000 (d) 32000
  39. 39.Round 8397 to the nearest thousand.
  40. 40.Which is closest to 593 ÷ 21? (a) 30 (b) 60 (c) 15 (d) 300

Answer key

  1. 20000
  2. 40
  3. 48000
  4. 74.4
  5. 800
  6. 11.3
  7. 60
  8. 70
  9. 80
  10. 67000
  11. 70
  12. 1300
  13. 1100
  14. 54000
  15. 14700
  16. 60
  17. 30
  18. 900
  19. 12000
  20. 71.9
  21. 81000
  22. 65.2
  23. 40
  24. 1600
  25. 72000
  26. 6000
  27. 95.4
  28. 60
  29. 4000
  30. 40
  31. 70
  32. 50
  33. 36000
  34. 16000
  35. 1800
  36. 1000
  37. 20
  38. 32000
  39. 8000
  40. 30

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