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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 33 · 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 497 + 903 + 501? (a) 2100 (b) 1900 (c) 2000 (d) 1800
  2. 2.Which is closest to 1203 ÷ 19? (a) 30 (b) 60 (c) 600 (d) 120
  3. 3.Which is closest to 2995 ÷ 49? (a) 30 (b) 60 (c) 120 (d) 600
  4. 4.Round 14572 to the nearest ten.
  5. 5.Which is closest to 898 × 31? (Round each number first.) (a) 27000 (b) 54000 (c) 2700 (d) 270000
  6. 6.Which is closest to 497 × 70? (Round each number first.) (a) 70000 (b) 35000 (c) 350000 (d) 3500
  7. 7.Round 42.33 to one decimal place. =
  8. 8.Round 46266 to the nearest ten.
  9. 9.Which is closest to 700 × 81? (Round each number first.) (a) 5600 (b) 112000 (c) 56000 (d) 560000
  10. 10.Which is closest to 299 × 91? (Round each number first.) (a) 27000 (b) 54000 (c) 2700 (d) 270000
  11. 11.Round 89761 to the nearest hundred.
  12. 12.Which is closest to 497 × 40? (Round each number first.) (a) 2000 (b) 20000 (c) 40000 (d) 200000
  13. 13.Which is closest to 897 + 604 + 500? (a) 2000 (b) 2200 (c) 2100 (d) 1900
  14. 14.Which is closest to 905 + 602 + 301? (a) 1700 (b) 2000 (c) 1900 (d) 1800
  15. 15.Which is closest to 1591 ÷ 19? (a) 160 (b) 800 (c) 40 (d) 80
  16. 16.Which is closest to 700 × 38? (Round each number first.) (a) 2800 (b) 280000 (c) 56000 (d) 28000
  17. 17.Which is closest to 4498 ÷ 51? (a) 90 (b) 180 (c) 900 (d) 45
  18. 18.Which is closest to 204 × 58? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  19. 19.Which is closest to 101 + 597 + 900? (a) 1800 (b) 1600 (c) 1500 (d) 1700
  20. 20.Which is closest to 297 × 82? (Round each number first.) (a) 24000 (b) 240000 (c) 2400 (d) 48000
  21. 21.Which is closest to 201 × 39? (Round each number first.) (a) 800 (b) 8000 (c) 16000 (d) 80000
  22. 22.Which is closest to 898 + 500 + 799? (a) 2200 (b) 2300 (c) 2100 (d) 2400
  23. 23.Round 13.89 to one decimal place. =
  24. 24.Round 11816 to the nearest hundred.
  25. 25.Which is closest to 992 ÷ 19? (a) 50 (b) 500 (c) 100 (d) 25
  26. 26.Round 21.68 to one decimal place. =
  27. 27.Which is closest to 696 × 48? (Round each number first.) (a) 3500 (b) 35000 (c) 350000 (d) 70000
  28. 28.Which is closest to 903 × 80? (Round each number first.) (a) 720000 (b) 7200 (c) 144000 (d) 72000
  29. 29.Round 56.66 to one decimal place. =
  30. 30.Which is closest to 1805 ÷ 19? (a) 180 (b) 90 (c) 45 (d) 900
  31. 31.Which is closest to 195 + 802 + 895? (a) 2100 (b) 2000 (c) 1800 (d) 1900
  32. 32.Round 90.22 to one decimal place. =
  33. 33.Which is closest to 401 + 805 + 498? (a) 1700 (b) 1900 (c) 1800 (d) 1600
  34. 34.Round 53.58 to one decimal place. =
  35. 35.Round 66.46 to one decimal place. =
  36. 36.Which is closest to 1602 ÷ 21? (a) 40 (b) 80 (c) 800 (d) 160
  37. 37.Round 58.39 to one decimal place. =
  38. 38.Round 80469 to the nearest hundred.
  39. 39.Round 52.57 to one decimal place. =
  40. 40.Which is closest to 1798 ÷ 31? (a) 600 (b) 60 (c) 30 (d) 120

Answer key

  1. 1900
  2. 60
  3. 60
  4. 14570
  5. 27000
  6. 35000
  7. 42.3
  8. 46270
  9. 56000
  10. 27000
  11. 89800
  12. 20000
  13. 2000
  14. 1800
  15. 80
  16. 28000
  17. 90
  18. 12000
  19. 1600
  20. 24000
  21. 8000
  22. 2200
  23. 13.9
  24. 11800
  25. 50
  26. 21.7
  27. 35000
  28. 72000
  29. 56.7
  30. 90
  31. 1900
  32. 90.2
  33. 1700
  34. 53.6
  35. 66.5
  36. 80
  37. 58.4
  38. 80500
  39. 52.6
  40. 60

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