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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 652 · 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 299 × 89? (Round each number first.) (a) 27000 (b) 54000 (c) 270000 (d) 2700
  2. 2.Which is closest to 899 × 82? (Round each number first.) (a) 144000 (b) 720000 (c) 7200 (d) 72000
  3. 3.Which is closest to 599 ÷ 29? (a) 10 (b) 40 (c) 200 (d) 20
  4. 4.Round 79978 to the nearest thousand.
  5. 5.Which is closest to 897 + 701 + 295? (a) 1900 (b) 1800 (c) 2100 (d) 2000
  6. 6.Round 71.93 to one decimal place. =
  7. 7.Which is closest to 1002 ÷ 49? (a) 200 (b) 40 (c) 20 (d) 10
  8. 8.Which is closest to 898 × 29? (Round each number first.) (a) 2700 (b) 270000 (c) 27000 (d) 54000
  9. 9.Which is closest to 606 ÷ 31? (a) 20 (b) 10 (c) 40 (d) 200
  10. 10.Round 38.28 to one decimal place. =
  11. 11.Round 41.66 to one decimal place. =
  12. 12.Which is closest to 596 + 495 + 501? (a) 1600 (b) 1800 (c) 1500 (d) 1700
  13. 13.Round 33.63 to one decimal place. =
  14. 14.Which is closest to 2000 ÷ 49? (a) 80 (b) 20 (c) 400 (d) 40
  15. 15.Which is closest to 1401 ÷ 19? (a) 700 (b) 70 (c) 140 (d) 35
  16. 16.Round 92.14 to one decimal place. =
  17. 17.Which is closest to 301 × 20? (Round each number first.) (a) 600 (b) 12000 (c) 60000 (d) 6000
  18. 18.Which is closest to 403 + 497 + 902? (a) 1900 (b) 1700 (c) 1800 (d) 2000
  19. 19.Which is closest to 2008 ÷ 41? (a) 500 (b) 25 (c) 50 (d) 100
  20. 20.Round 98.53 to one decimal place. =
  21. 21.Which is closest to 699 + 597 + 199? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  22. 22.Round 36385 to the nearest thousand.
  23. 23.Which is closest to 606 ÷ 21? (a) 30 (b) 15 (c) 60 (d) 300
  24. 24.Round 64.87 to one decimal place. =
  25. 25.Round 94734 to the nearest hundred.
  26. 26.Round 10.16 to one decimal place. =
  27. 27.Round 44.21 to one decimal place. =
  28. 28.Which is closest to 700 × 21? (Round each number first.) (a) 28000 (b) 1400 (c) 140000 (d) 14000
  29. 29.Which is closest to 597 ÷ 21? (a) 300 (b) 60 (c) 15 (d) 30
  30. 30.Which is closest to 397 + 902 + 905? (a) 2300 (b) 2100 (c) 2400 (d) 2200
  31. 31.Round 46496 to the nearest thousand.
  32. 32.Round 91513 to the nearest ten.
  33. 33.Which is closest to 299 + 699 + 799? (a) 1700 (b) 2000 (c) 1900 (d) 1800
  34. 34.Round 66451 to the nearest hundred.
  35. 35.Which is closest to 602 × 59? (Round each number first.) (a) 3600 (b) 72000 (c) 36000 (d) 360000
  36. 36.Round 47454 to the nearest ten.
  37. 37.Which is closest to 98 + 305 + 700? (a) 1000 (b) 1100 (c) 1300 (d) 1200
  38. 38.Which is closest to 101 + 798 + 805? (a) 1900 (b) 1800 (c) 1700 (d) 1600
  39. 39.Which is closest to 2806 ÷ 39? (a) 140 (b) 35 (c) 70 (d) 700
  40. 40.Which is closest to 2091 ÷ 29? (a) 140 (b) 35 (c) 700 (d) 70

Answer key

  1. 27000
  2. 72000
  3. 20
  4. 80000
  5. 1900
  6. 71.9
  7. 20
  8. 27000
  9. 20
  10. 38.3
  11. 41.7
  12. 1600
  13. 33.6
  14. 40
  15. 70
  16. 92.1
  17. 6000
  18. 1800
  19. 50
  20. 98.5
  21. 1500
  22. 36000
  23. 30
  24. 64.9
  25. 94700
  26. 10.2
  27. 44.2
  28. 14000
  29. 30
  30. 2200
  31. 46000
  32. 91510
  33. 1800
  34. 66500
  35. 36000
  36. 47450
  37. 1100
  38. 1700
  39. 70
  40. 70

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