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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 73 · 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 2394 ÷ 41? (a) 30 (b) 120 (c) 600 (d) 60
  2. 2.Round 13.59 to one decimal place. =
  3. 3.Which is closest to 500 + 500 + 196? (a) 1400 (b) 1300 (c) 1200 (d) 1100
  4. 4.Which is closest to 3502 ÷ 49? (a) 70 (b) 700 (c) 35 (d) 140
  5. 5.Which is closest to 901 × 20? (Round each number first.) (a) 36000 (b) 18000 (c) 1800 (d) 180000
  6. 6.Which is closest to 696 + 603 + 201? (a) 1400 (b) 1600 (c) 1700 (d) 1500
  7. 7.Which is closest to 2391 ÷ 31? (a) 40 (b) 80 (c) 800 (d) 160
  8. 8.Round 89462 to the nearest ten.
  9. 9.Round 46.41 to one decimal place. =
  10. 10.Which is closest to 97 + 499 + 200? (a) 1000 (b) 700 (c) 900 (d) 800
  11. 11.Which is closest to 402 × 32? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000
  12. 12.Which is closest to 203 + 395 + 297? (a) 1000 (b) 900 (c) 1100 (d) 800
  13. 13.Round 19.08 to one decimal place. =
  14. 14.Round 41.51 to one decimal place. =
  15. 15.Round 65148 to the nearest hundred.
  16. 16.Which is closest to 704 + 799 + 297? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  17. 17.Round 88.18 to one decimal place. =
  18. 18.Which is closest to 1203 ÷ 19? (a) 600 (b) 30 (c) 120 (d) 60
  19. 19.Round 54.41 to one decimal place. =
  20. 20.Round 51684 to the nearest thousand.
  21. 21.Which is closest to 793 ÷ 39? (a) 10 (b) 200 (c) 40 (d) 20
  22. 22.Which is closest to 602 + 595 + 396? (a) 1600 (b) 1500 (c) 1800 (d) 1700
  23. 23.Which is closest to 297 × 29? (Round each number first.) (a) 18000 (b) 9000 (c) 90000 (d) 900
  24. 24.Round 16.11 to one decimal place. =
  25. 25.Which is closest to 401 ÷ 21? (a) 10 (b) 40 (c) 20 (d) 200
  26. 26.Round 44.59 to one decimal place. =
  27. 27.Which is closest to 505 + 595 + 199? (a) 1500 (b) 1400 (c) 1300 (d) 1200
  28. 28.Round 95.72 to one decimal place. =
  29. 29.Round 79451 to the nearest thousand.
  30. 30.Which is closest to 699 × 42? (Round each number first.) (a) 56000 (b) 28000 (c) 280000 (d) 2800
  31. 31.Which is closest to 497 × 31? (Round each number first.) (a) 15000 (b) 30000 (c) 1500 (d) 150000
  32. 32.Round 64.37 to one decimal place. =
  33. 33.Round 18.79 to one decimal place. =
  34. 34.Round 13.89 to one decimal place. =
  35. 35.Round 36.72 to one decimal place. =
  36. 36.Round 72.39 to one decimal place. =
  37. 37.Which is closest to 297 + 300 + 304? (a) 1100 (b) 1000 (c) 900 (d) 800
  38. 38.Which is closest to 402 × 89? (Round each number first.) (a) 360000 (b) 3600 (c) 72000 (d) 36000
  39. 39.Round 21861 to the nearest ten.
  40. 40.Which is closest to 105 + 895 + 402? (a) 1500 (b) 1300 (c) 1600 (d) 1400

Answer key

  1. 60
  2. 13.6
  3. 1200
  4. 70
  5. 18000
  6. 1500
  7. 80
  8. 89460
  9. 46.4
  10. 800
  11. 12000
  12. 900
  13. 19.1
  14. 41.5
  15. 65100
  16. 1800
  17. 88.2
  18. 60
  19. 54.4
  20. 52000
  21. 20
  22. 1600
  23. 9000
  24. 16.1
  25. 20
  26. 44.6
  27. 1300
  28. 95.7
  29. 79000
  30. 28000
  31. 15000
  32. 64.4
  33. 18.8
  34. 13.9
  35. 36.7
  36. 72.4
  37. 900
  38. 36000
  39. 21860
  40. 1400

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