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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 74 · 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 72.58 to one decimal place. =
  2. 2.Which is closest to 3607 ÷ 39? (a) 45 (b) 90 (c) 900 (d) 180
  3. 3.Which is closest to 705 + 596 + 799? (a) 2200 (b) 2300 (c) 2100 (d) 2000
  4. 4.Which is closest to 1795 ÷ 31? (a) 30 (b) 120 (c) 600 (d) 60
  5. 5.Which is closest to 296 × 88? (Round each number first.) (a) 27000 (b) 2700 (c) 270000 (d) 54000
  6. 6.Which is closest to 495 + 204 + 398? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  7. 7.Which is closest to 198 + 496 + 596? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  8. 8.Which is closest to 797 × 82? (Round each number first.) (a) 640000 (b) 128000 (c) 6400 (d) 64000
  9. 9.Round 10.21 to one decimal place. =
  10. 10.Round 67.38 to one decimal place. =
  11. 11.Round 76101 to the nearest ten.
  12. 12.Which is closest to 295 + 605 + 899? (a) 2000 (b) 1900 (c) 1800 (d) 1700
  13. 13.Which is closest to 200 × 39? (Round each number first.) (a) 80000 (b) 800 (c) 8000 (d) 16000
  14. 14.Which is closest to 598 × 60? (Round each number first.) (a) 360000 (b) 36000 (c) 72000 (d) 3600
  15. 15.Which is closest to 300 × 91? (Round each number first.) (a) 54000 (b) 2700 (c) 27000 (d) 270000
  16. 16.Which is closest to 600 + 502 + 801? (a) 1900 (b) 1800 (c) 2000 (d) 2100
  17. 17.Which is closest to 201 × 58? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  18. 18.Which is closest to 199 × 38? (Round each number first.) (a) 80000 (b) 16000 (c) 800 (d) 8000
  19. 19.Which is closest to 2491 ÷ 51? (a) 500 (b) 50 (c) 25 (d) 100
  20. 20.Which is closest to 498 + 405 + 104? (a) 1200 (b) 900 (c) 1000 (d) 1100
  21. 21.Round 69.72 to one decimal place. =
  22. 22.Round 57204 to the nearest ten.
  23. 23.Round 12225 to the nearest thousand.
  24. 24.Which is closest to 798 × 40? (Round each number first.) (a) 3200 (b) 64000 (c) 32000 (d) 320000
  25. 25.Which is closest to 1204 ÷ 39? (a) 60 (b) 30 (c) 15 (d) 300
  26. 26.Round 29744 to the nearest hundred.
  27. 27.Round 33.84 to one decimal place. =
  28. 28.Which is closest to 901 + 104 + 599? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  29. 29.Round 33378 to the nearest ten.
  30. 30.Which is closest to 497 × 68? (Round each number first.) (a) 70000 (b) 35000 (c) 3500 (d) 350000
  31. 31.Round 71063 to the nearest hundred.
  32. 32.Round 62.27 to one decimal place. =
  33. 33.Which is closest to 597 × 69? (Round each number first.) (a) 42000 (b) 420000 (c) 4200 (d) 84000
  34. 34.Round 31517 to the nearest hundred.
  35. 35.Round 52618 to the nearest ten.
  36. 36.Round 29276 to the nearest hundred.
  37. 37.Which is closest to 2397 ÷ 31? (a) 800 (b) 40 (c) 160 (d) 80
  38. 38.Round 18596 to the nearest hundred.
  39. 39.Which is closest to 204 × 59? (Round each number first.) (a) 12000 (b) 1200 (c) 24000 (d) 120000
  40. 40.Round 38.11 to one decimal place. =

Answer key

  1. 72.6
  2. 90
  3. 2100
  4. 60
  5. 27000
  6. 1100
  7. 1300
  8. 64000
  9. 10.2
  10. 67.4
  11. 76100
  12. 1800
  13. 8000
  14. 36000
  15. 27000
  16. 1900
  17. 12000
  18. 8000
  19. 50
  20. 1000
  21. 69.7
  22. 57200
  23. 12000
  24. 32000
  25. 30
  26. 29700
  27. 33.8
  28. 1600
  29. 33380
  30. 35000
  31. 71100
  32. 62.3
  33. 42000
  34. 31500
  35. 52620
  36. 29300
  37. 80
  38. 18600
  39. 12000
  40. 38.1

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