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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 834 · 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 1803 ÷ 21? (a) 180 (b) 90 (c) 45 (d) 900
  2. 2.Which is closest to 2400 ÷ 39? (a) 120 (b) 60 (c) 600 (d) 30
  3. 3.Round 99459 to the nearest hundred.
  4. 4.Which is closest to 801 + 495 + 696? (a) 2000 (b) 2100 (c) 1900 (d) 2200
  5. 5.Which is closest to 200 + 305 + 397? (a) 1100 (b) 1000 (c) 800 (d) 900
  6. 6.Which is closest to 400 + 897 + 805? (a) 2200 (b) 2000 (c) 2100 (d) 2300
  7. 7.Which is closest to 202 × 68? (Round each number first.) (a) 28000 (b) 140000 (c) 14000 (d) 1400
  8. 8.Which is closest to 796 × 40? (Round each number first.) (a) 3200 (b) 64000 (c) 320000 (d) 32000
  9. 9.Which is closest to 1493 ÷ 31? (a) 100 (b) 50 (c) 500 (d) 25
  10. 10.Which is closest to 404 + 495 + 395? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  11. 11.Round 48.69 to one decimal place. =
  12. 12.Round 33.51 to one decimal place. =
  13. 13.Round 42492 to the nearest hundred.
  14. 14.Which is closest to 397 + 600 + 197? (a) 1300 (b) 1400 (c) 1200 (d) 1100
  15. 15.Which is closest to 2399 ÷ 31? (a) 80 (b) 800 (c) 40 (d) 160
  16. 16.Which is closest to 2394 ÷ 41? (a) 120 (b) 600 (c) 30 (d) 60
  17. 17.Which is closest to 297 × 39? (Round each number first.) (a) 12000 (b) 120000 (c) 1200 (d) 24000
  18. 18.Which is closest to 505 + 796 + 197? (a) 1700 (b) 1500 (c) 1600 (d) 1400
  19. 19.Which is closest to 1004 ÷ 19? (a) 50 (b) 25 (c) 100 (d) 500
  20. 20.Round 29.89 to one decimal place. =
  21. 21.Which is closest to 1599 ÷ 41? (a) 80 (b) 20 (c) 400 (d) 40
  22. 22.Which is closest to 197 + 701 + 900? (a) 2000 (b) 1700 (c) 1900 (d) 1800
  23. 23.Which is closest to 1496 ÷ 29? (a) 500 (b) 100 (c) 25 (d) 50
  24. 24.Round 58.13 to one decimal place. =
  25. 25.Which is closest to 897 × 28? (Round each number first.) (a) 270000 (b) 27000 (c) 54000 (d) 2700
  26. 26.Which is closest to 602 × 39? (Round each number first.) (a) 48000 (b) 24000 (c) 240000 (d) 2400
  27. 27.Which is closest to 196 + 796 + 101? (a) 1300 (b) 1000 (c) 1100 (d) 1200
  28. 28.Which is closest to 96 + 604 + 97? (a) 700 (b) 800 (c) 900 (d) 1000
  29. 29.Which is closest to 804 × 39? (Round each number first.) (a) 32000 (b) 64000 (c) 320000 (d) 3200
  30. 30.Round 55.68 to one decimal place. =
  31. 31.Which is closest to 2994 ÷ 49? (a) 30 (b) 120 (c) 600 (d) 60
  32. 32.Which is closest to 597 + 502 + 600? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  33. 33.Which is closest to 902 × 29? (Round each number first.) (a) 270000 (b) 2700 (c) 27000 (d) 54000
  34. 34.Round 44451 to the nearest ten.
  35. 35.Which is closest to 298 × 19? (Round each number first.) (a) 12000 (b) 600 (c) 6000 (d) 60000
  36. 36.Round 88069 to the nearest thousand.
  37. 37.Which is closest to 2405 ÷ 39? (a) 600 (b) 60 (c) 120 (d) 30
  38. 38.Round 80593 to the nearest thousand.
  39. 39.Which is closest to 797 × 62? (Round each number first.) (a) 4800 (b) 96000 (c) 480000 (d) 48000
  40. 40.Round 98.88 to one decimal place. =

Answer key

  1. 90
  2. 60
  3. 99500
  4. 2000
  5. 900
  6. 2100
  7. 14000
  8. 32000
  9. 50
  10. 1300
  11. 48.7
  12. 33.5
  13. 42500
  14. 1200
  15. 80
  16. 60
  17. 12000
  18. 1500
  19. 50
  20. 29.9
  21. 40
  22. 1800
  23. 50
  24. 58.1
  25. 27000
  26. 24000
  27. 1100
  28. 800
  29. 32000
  30. 55.7
  31. 60
  32. 1700
  33. 27000
  34. 44450
  35. 6000
  36. 88000
  37. 60
  38. 81000
  39. 48000
  40. 98.9

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