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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 133 · 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.Round 21975 to the nearest hundred.
  2. 2.Round 80067 to the nearest hundred.
  3. 3.Which is closest to 1206 ÷ 19? (a) 600 (b) 60 (c) 120 (d) 30
  4. 4.Round 9573 to the nearest ten.
  5. 5.Round 4890 to the nearest hundred.
  6. 6.Round 61.21 to one decimal place. =
  7. 7.Which is closest to 602 × 49? (Round each number first.) (a) 300000 (b) 60000 (c) 30000 (d) 3000
  8. 8.Round 92.81 to one decimal place. =
  9. 9.Which is closest to 801 × 20? (Round each number first.) (a) 160000 (b) 1600 (c) 16000 (d) 32000
  10. 10.Which is closest to 397 × 31? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  11. 11.Which is closest to 201 × 48? (Round each number first.) (a) 1000 (b) 20000 (c) 10000 (d) 100000
  12. 12.Which is closest to 298 + 696 + 599? (a) 1600 (b) 1800 (c) 1500 (d) 1700
  13. 13.Which is closest to 602 ÷ 21? (a) 300 (b) 15 (c) 30 (d) 60
  14. 14.Round 73.27 to one decimal place. =
  15. 15.Which is closest to 2998 ÷ 49? (a) 600 (b) 60 (c) 30 (d) 120
  16. 16.Which is closest to 99 + 298 + 102? (a) 600 (b) 700 (c) 400 (d) 500
  17. 17.Round 76.39 to one decimal place. =
  18. 18.Round 50143 to the nearest hundred.
  19. 19.Round 24.16 to one decimal place. =
  20. 20.Which is closest to 900 × 39? (Round each number first.) (a) 72000 (b) 3600 (c) 360000 (d) 36000
  21. 21.Round 58.19 to one decimal place. =
  22. 22.Round 23370 to the nearest thousand.
  23. 23.Round 23.71 to one decimal place. =
  24. 24.Round 75728 to the nearest ten.
  25. 25.Which is closest to 502 × 72? (Round each number first.) (a) 350000 (b) 3500 (c) 70000 (d) 35000
  26. 26.Which is closest to 398 × 61? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  27. 27.Round 95.82 to one decimal place. =
  28. 28.Which is closest to 102 + 804 + 597? (a) 1600 (b) 1700 (c) 1400 (d) 1500
  29. 29.Round 95576 to the nearest thousand.
  30. 30.Round 17.06 to one decimal place. =
  31. 31.Round 48.63 to one decimal place. =
  32. 32.Round 60511 to the nearest thousand.
  33. 33.Which is closest to 397 × 72? (Round each number first.) (a) 56000 (b) 28000 (c) 280000 (d) 2800
  34. 34.Round 39261 to the nearest ten.
  35. 35.Which is closest to 3496 ÷ 51? (a) 140 (b) 70 (c) 35 (d) 700
  36. 36.Which is closest to 698 + 401 + 295? (a) 1600 (b) 1300 (c) 1500 (d) 1400
  37. 37.Round 60.53 to one decimal place. =
  38. 38.Which is closest to 604 + 196 + 701? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  39. 39.Which is closest to 2397 ÷ 41? (a) 30 (b) 120 (c) 60 (d) 600
  40. 40.Which is closest to 902 ÷ 29? (a) 60 (b) 15 (c) 300 (d) 30

Answer key

  1. 22000
  2. 80100
  3. 60
  4. 9570
  5. 4900
  6. 61.2
  7. 30000
  8. 92.8
  9. 16000
  10. 12000
  11. 10000
  12. 1600
  13. 30
  14. 73.3
  15. 60
  16. 500
  17. 76.4
  18. 50100
  19. 24.2
  20. 36000
  21. 58.2
  22. 23000
  23. 23.7
  24. 75730
  25. 35000
  26. 24000
  27. 95.8
  28. 1500
  29. 96000
  30. 17.1
  31. 48.6
  32. 61000
  33. 28000
  34. 39260
  35. 70
  36. 1400
  37. 60.5
  38. 1500
  39. 60
  40. 30

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