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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 510 · 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 800 × 61? (Round each number first.) (a) 48000 (b) 480000 (c) 4800 (d) 96000
  2. 2.Round 68416 to the nearest thousand.
  3. 3.Which is closest to 103 + 396 + 498? (a) 900 (b) 1100 (c) 1200 (d) 1000
  4. 4.Which is closest to 802 + 897 + 795? (a) 2700 (b) 2600 (c) 2400 (d) 2500
  5. 5.Which is closest to 3195 ÷ 39? (a) 40 (b) 80 (c) 800 (d) 160
  6. 6.Which is closest to 4002 ÷ 49? (a) 800 (b) 40 (c) 160 (d) 80
  7. 7.Round 52.43 to one decimal place. =
  8. 8.Which is closest to 995 ÷ 49? (a) 40 (b) 20 (c) 200 (d) 10
  9. 9.Round 97.19 to one decimal place. =
  10. 10.Round 32281 to the nearest thousand.
  11. 11.Which is closest to 701 × 89? (Round each number first.) (a) 630000 (b) 126000 (c) 6300 (d) 63000
  12. 12.Which is closest to 399 × 91? (Round each number first.) (a) 360000 (b) 72000 (c) 3600 (d) 36000
  13. 13.Round 78.09 to one decimal place. =
  14. 14.Which is closest to 400 + 98 + 896? (a) 1600 (b) 1500 (c) 1300 (d) 1400
  15. 15.Which is closest to 99 + 798 + 497? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  16. 16.Which is closest to 800 × 51? (Round each number first.) (a) 80000 (b) 400000 (c) 4000 (d) 40000
  17. 17.Which is closest to 197 × 91? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  18. 18.Which is closest to 900 + 405 + 396? (a) 1700 (b) 1900 (c) 1800 (d) 1600
  19. 19.Round 45.68 to one decimal place. =
  20. 20.Round 7412 to the nearest hundred.
  21. 21.Round 42.66 to one decimal place. =
  22. 22.Round 49.72 to one decimal place. =
  23. 23.Round 66.81 to one decimal place. =
  24. 24.Which is closest to 195 + 498 + 599? (a) 1500 (b) 1300 (c) 1400 (d) 1200
  25. 25.Which is closest to 601 × 88? (Round each number first.) (a) 54000 (b) 108000 (c) 5400 (d) 540000
  26. 26.Round 20.06 to one decimal place. =
  27. 27.Round 22.06 to one decimal place. =
  28. 28.Which is closest to 495 + 797 + 200? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  29. 29.Which is closest to 898 + 205 + 104? (a) 1200 (b) 1300 (c) 1400 (d) 1100
  30. 30.Round 25.84 to one decimal place. =
  31. 31.Round 33.34 to one decimal place. =
  32. 32.Which is closest to 598 × 71? (Round each number first.) (a) 4200 (b) 420000 (c) 42000 (d) 84000
  33. 33.Which is closest to 4007 ÷ 49? (a) 800 (b) 80 (c) 40 (d) 160
  34. 34.Round 1704 to the nearest ten.
  35. 35.Round 90.52 to one decimal place. =
  36. 36.Which is closest to 1793 ÷ 31? (a) 600 (b) 120 (c) 60 (d) 30
  37. 37.Round 66.38 to one decimal place. =
  38. 38.Which is closest to 1409 ÷ 19? (a) 70 (b) 700 (c) 140 (d) 35
  39. 39.Which is closest to 902 × 41? (Round each number first.) (a) 72000 (b) 360000 (c) 36000 (d) 3600
  40. 40.Which is closest to 201 × 19? (Round each number first.) (a) 40000 (b) 8000 (c) 4000 (d) 400

Answer key

  1. 48000
  2. 68000
  3. 1000
  4. 2500
  5. 80
  6. 80
  7. 52.4
  8. 20
  9. 97.2
  10. 32000
  11. 63000
  12. 36000
  13. 78.1
  14. 1400
  15. 1400
  16. 40000
  17. 18000
  18. 1700
  19. 45.7
  20. 7400
  21. 42.7
  22. 49.7
  23. 66.8
  24. 1300
  25. 54000
  26. 20.1
  27. 22.1
  28. 1500
  29. 1200
  30. 25.8
  31. 33.3
  32. 42000
  33. 80
  34. 1700
  35. 90.5
  36. 60
  37. 66.4
  38. 70
  39. 36000
  40. 4000

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