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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 791 · 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 199 × 21? (Round each number first.) (a) 40000 (b) 4000 (c) 8000 (d) 400
  2. 2.Which is closest to 1198 ÷ 29? (a) 20 (b) 80 (c) 40 (d) 400
  3. 3.Which is closest to 600 + 297 + 396? (a) 1500 (b) 1300 (c) 1400 (d) 1200
  4. 4.Round 35.52 to one decimal place. =
  5. 5.Which is closest to 597 × 51? (Round each number first.) (a) 3000 (b) 300000 (c) 60000 (d) 30000
  6. 6.Round 36.26 to one decimal place. =
  7. 7.Round 21291 to the nearest ten.
  8. 8.Round 5654 to the nearest thousand.
  9. 9.Round 97.94 to one decimal place. =
  10. 10.Which is closest to 605 ÷ 29? (a) 40 (b) 200 (c) 20 (d) 10
  11. 11.Which is closest to 97 + 602 + 801? (a) 1400 (b) 1600 (c) 1500 (d) 1700
  12. 12.Round 59018 to the nearest ten.
  13. 13.Which is closest to 904 ÷ 29? (a) 15 (b) 300 (c) 60 (d) 30
  14. 14.Which is closest to 1395 ÷ 21? (a) 70 (b) 700 (c) 140 (d) 35
  15. 15.Which is closest to 204 × 48? (Round each number first.) (a) 1000 (b) 20000 (c) 100000 (d) 10000
  16. 16.Which is closest to 496 × 42? (Round each number first.) (a) 20000 (b) 2000 (c) 40000 (d) 200000
  17. 17.Which is closest to 297 × 91? (Round each number first.) (a) 27000 (b) 54000 (c) 270000 (d) 2700
  18. 18.Which is closest to 104 + 96 + 796? (a) 1200 (b) 900 (c) 1100 (d) 1000
  19. 19.Which is closest to 904 × 29? (Round each number first.) (a) 54000 (b) 27000 (c) 2700 (d) 270000
  20. 20.Which is closest to 399 × 60? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  21. 21.Which is closest to 1505 ÷ 49? (a) 60 (b) 15 (c) 300 (d) 30
  22. 22.Which is closest to 3009 ÷ 49? (a) 120 (b) 30 (c) 600 (d) 60
  23. 23.Round 98.08 to one decimal place. =
  24. 24.Which is closest to 800 + 302 + 396? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  25. 25.Which is closest to 995 ÷ 49? (a) 40 (b) 20 (c) 10 (d) 200
  26. 26.Which is closest to 2793 ÷ 41? (a) 35 (b) 700 (c) 70 (d) 140
  27. 27.Round 89105 to the nearest hundred.
  28. 28.Which is closest to 799 × 42? (Round each number first.) (a) 32000 (b) 3200 (c) 320000 (d) 64000
  29. 29.Which is closest to 501 × 48? (Round each number first.) (a) 250000 (b) 50000 (c) 25000 (d) 2500
  30. 30.Round 19.08 to one decimal place. =
  31. 31.Which is closest to 806 ÷ 21? (a) 80 (b) 20 (c) 40 (d) 400
  32. 32.Which is closest to 203 + 696 + 705? (a) 1800 (b) 1500 (c) 1600 (d) 1700
  33. 33.Which is closest to 1399 ÷ 21? (a) 35 (b) 70 (c) 700 (d) 140
  34. 34.Which is closest to 901 + 900 + 897? (a) 2800 (b) 2700 (c) 2600 (d) 2900
  35. 35.Which is closest to 2100 ÷ 29? (a) 140 (b) 70 (c) 35 (d) 700
  36. 36.Which is closest to 96 + 695 + 698? (a) 1400 (b) 1600 (c) 1700 (d) 1500
  37. 37.Which is closest to 1404 ÷ 19? (a) 70 (b) 140 (c) 700 (d) 35
  38. 38.Which is closest to 303 + 203 + 898? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  39. 39.Which is closest to 4495 ÷ 49? (a) 900 (b) 180 (c) 45 (d) 90
  40. 40.Round 55.87 to one decimal place. =

Answer key

  1. 4000
  2. 40
  3. 1300
  4. 35.5
  5. 30000
  6. 36.3
  7. 21290
  8. 6000
  9. 97.9
  10. 20
  11. 1500
  12. 59020
  13. 30
  14. 70
  15. 10000
  16. 20000
  17. 27000
  18. 1000
  19. 27000
  20. 24000
  21. 30
  22. 60
  23. 98.1
  24. 1500
  25. 20
  26. 70
  27. 89100
  28. 32000
  29. 25000
  30. 19.1
  31. 40
  32. 1600
  33. 70
  34. 2700
  35. 70
  36. 1500
  37. 70
  38. 1400
  39. 90
  40. 55.9

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