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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 131 · 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 25915 to the nearest thousand.
  2. 2.Round 24.88 to one decimal place. =
  3. 3.Round 43.34 to one decimal place. =
  4. 4.Which is closest to 201 + 302 + 203? (a) 600 (b) 700 (c) 900 (d) 800
  5. 5.Round 38939 to the nearest hundred.
  6. 6.Which is closest to 104 + 701 + 297? (a) 1000 (b) 1200 (c) 1100 (d) 1300
  7. 7.Which is closest to 602 + 603 + 904? (a) 2200 (b) 2300 (c) 2000 (d) 2100
  8. 8.Which is closest to 202 + 703 + 202? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  9. 9.Which is closest to 802 ÷ 19? (a) 400 (b) 80 (c) 20 (d) 40
  10. 10.Round 50.57 to one decimal place. =
  11. 11.Which is closest to 799 ÷ 21? (a) 40 (b) 20 (c) 80 (d) 400
  12. 12.Round 40115 to the nearest thousand.
  13. 13.Round 25578 to the nearest ten.
  14. 14.Round 94.56 to one decimal place. =
  15. 15.Which is closest to 1404 ÷ 19? (a) 140 (b) 35 (c) 70 (d) 700
  16. 16.Round 90059 to the nearest hundred.
  17. 17.Round 72418 to the nearest thousand.
  18. 18.Which is closest to 899 × 78? (Round each number first.) (a) 720000 (b) 7200 (c) 72000 (d) 144000
  19. 19.Round 88.32 to one decimal place. =
  20. 20.Which is closest to 2391 ÷ 39? (a) 120 (b) 60 (c) 600 (d) 30
  21. 21.Which is closest to 992 ÷ 21? (a) 25 (b) 100 (c) 500 (d) 50
  22. 22.Which is closest to 700 + 698 + 503? (a) 1900 (b) 2100 (c) 2000 (d) 1800
  23. 23.Round 82563 to the nearest thousand.
  24. 24.Which is closest to 496 + 497 + 296? (a) 1500 (b) 1200 (c) 1400 (d) 1300
  25. 25.Round 9868 to the nearest hundred.
  26. 26.Round 72.89 to one decimal place. =
  27. 27.Round 53.37 to one decimal place. =
  28. 28.Which is closest to 797 × 38? (Round each number first.) (a) 32000 (b) 64000 (c) 320000 (d) 3200
  29. 29.Which is closest to 901 + 801 + 705? (a) 2500 (b) 2600 (c) 2300 (d) 2400
  30. 30.Round 81.81 to one decimal place. =
  31. 31.Round 18.77 to one decimal place. =
  32. 32.Which is closest to 600 × 22? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  33. 33.Which is closest to 903 × 31? (Round each number first.) (a) 54000 (b) 2700 (c) 27000 (d) 270000
  34. 34.Round 41828 to the nearest thousand.
  35. 35.Round 56584 to the nearest hundred.
  36. 36.Which is closest to 596 + 96 + 600? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  37. 37.Which is closest to 196 × 59? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  38. 38.Round 99.37 to one decimal place. =
  39. 39.Which is closest to 1204 ÷ 29? (a) 400 (b) 20 (c) 80 (d) 40
  40. 40.Which is closest to 3507 ÷ 49? (a) 700 (b) 35 (c) 70 (d) 140

Answer key

  1. 26000
  2. 24.9
  3. 43.3
  4. 700
  5. 38900
  6. 1100
  7. 2100
  8. 1100
  9. 40
  10. 50.6
  11. 40
  12. 40000
  13. 25580
  14. 94.6
  15. 70
  16. 90100
  17. 72000
  18. 72000
  19. 88.3
  20. 60
  21. 50
  22. 1900
  23. 83000
  24. 1300
  25. 9900
  26. 72.9
  27. 53.4
  28. 32000
  29. 2400
  30. 81.8
  31. 18.8
  32. 12000
  33. 27000
  34. 42000
  35. 56600
  36. 1300
  37. 12000
  38. 99.4
  39. 40
  40. 70

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