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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 672 · 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 304 × 88? (Round each number first.) (a) 54000 (b) 270000 (c) 27000 (d) 2700
  2. 2.Which is closest to 302 + 96 + 405? (a) 1000 (b) 700 (c) 800 (d) 900
  3. 3.Round 34.74 to one decimal place. =
  4. 4.Which is closest to 202 + 604 + 905? (a) 1800 (b) 1600 (c) 1900 (d) 1700
  5. 5.Which is closest to 804 + 500 + 296? (a) 1500 (b) 1800 (c) 1600 (d) 1700
  6. 6.Which is closest to 2492 ÷ 49? (a) 500 (b) 50 (c) 100 (d) 25
  7. 7.Which is closest to 299 + 398 + 704? (a) 1500 (b) 1600 (c) 1300 (d) 1400
  8. 8.Which is closest to 1609 ÷ 21? (a) 800 (b) 160 (c) 80 (d) 40
  9. 9.Round 13649 to the nearest hundred.
  10. 10.Round 3409 to the nearest ten.
  11. 11.Which is closest to 803 × 29? (Round each number first.) (a) 2400 (b) 24000 (c) 48000 (d) 240000
  12. 12.Which is closest to 199 + 596 + 600? (a) 1400 (b) 1300 (c) 1600 (d) 1500
  13. 13.Round 71.33 to one decimal place. =
  14. 14.Round 25.82 to one decimal place. =
  15. 15.Round 50982 to the nearest ten.
  16. 16.Which is closest to 702 × 82? (Round each number first.) (a) 56000 (b) 112000 (c) 5600 (d) 560000
  17. 17.Which is closest to 500 × 92? (Round each number first.) (a) 90000 (b) 450000 (c) 4500 (d) 45000
  18. 18.Which is closest to 697 + 103 + 695? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  19. 19.Which is closest to 800 × 72? (Round each number first.) (a) 560000 (b) 56000 (c) 5600 (d) 112000
  20. 20.Which is closest to 603 + 496 + 98? (a) 1100 (b) 1200 (c) 1300 (d) 1400
  21. 21.Which is closest to 898 × 21? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  22. 22.Which is closest to 1794 ÷ 29? (a) 60 (b) 30 (c) 600 (d) 120
  23. 23.Round 30487 to the nearest hundred.
  24. 24.Which is closest to 1008 ÷ 49? (a) 200 (b) 10 (c) 40 (d) 20
  25. 25.Which is closest to 1496 ÷ 49? (a) 15 (b) 60 (c) 30 (d) 300
  26. 26.Round 11208 to the nearest hundred.
  27. 27.Round 64684 to the nearest ten.
  28. 28.Which is closest to 991 ÷ 51? (a) 200 (b) 40 (c) 20 (d) 10
  29. 29.Which is closest to 607 ÷ 29? (a) 20 (b) 200 (c) 10 (d) 40
  30. 30.Which is closest to 901 × 32? (Round each number first.) (a) 2700 (b) 27000 (c) 270000 (d) 54000
  31. 31.Round 63299 to the nearest thousand.
  32. 32.Which is closest to 799 × 39? (Round each number first.) (a) 3200 (b) 32000 (c) 320000 (d) 64000
  33. 33.Round 34.77 to one decimal place. =
  34. 34.Round 52.92 to one decimal place. =
  35. 35.Which is closest to 197 × 78? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  36. 36.Which is closest to 604 + 896 + 795? (a) 2200 (b) 2300 (c) 2500 (d) 2400
  37. 37.Round 93.76 to one decimal place. =
  38. 38.Which is closest to 97 + 204 + 396? (a) 900 (b) 800 (c) 700 (d) 600
  39. 39.Which is closest to 796 + 401 + 903? (a) 2100 (b) 2000 (c) 2300 (d) 2200
  40. 40.Round 90.83 to one decimal place. =

Answer key

  1. 27000
  2. 800
  3. 34.7
  4. 1700
  5. 1600
  6. 50
  7. 1400
  8. 80
  9. 13600
  10. 3410
  11. 24000
  12. 1400
  13. 71.3
  14. 25.8
  15. 50980
  16. 56000
  17. 45000
  18. 1500
  19. 56000
  20. 1200
  21. 18000
  22. 60
  23. 30500
  24. 20
  25. 30
  26. 11200
  27. 64680
  28. 20
  29. 20
  30. 27000
  31. 63000
  32. 32000
  33. 34.8
  34. 52.9
  35. 16000
  36. 2300
  37. 93.8
  38. 700
  39. 2100
  40. 90.8

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