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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 452 · 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 904 + 99 + 97? (a) 1300 (b) 1200 (c) 1000 (d) 1100
  2. 2.Which is closest to 2093 ÷ 29? (a) 70 (b) 35 (c) 140 (d) 700
  3. 3.Which is closest to 199 + 205 + 899? (a) 1200 (b) 1500 (c) 1400 (d) 1300
  4. 4.Round 61306 to the nearest thousand.
  5. 5.Round 35.12 to one decimal place. =
  6. 6.Round 27.41 to one decimal place. =
  7. 7.Which is closest to 197 + 199 + 196? (a) 700 (b) 800 (c) 500 (d) 600
  8. 8.Which is closest to 703 + 400 + 805? (a) 1800 (b) 1900 (c) 2000 (d) 2100
  9. 9.Round 19.84 to one decimal place. =
  10. 10.Which is closest to 298 × 80? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  11. 11.Which is closest to 199 × 48? (Round each number first.) (a) 1000 (b) 100000 (c) 20000 (d) 10000
  12. 12.Which is closest to 402 × 31? (Round each number first.) (a) 24000 (b) 120000 (c) 12000 (d) 1200
  13. 13.Round 75.53 to one decimal place. =
  14. 14.Round 27962 to the nearest thousand.
  15. 15.Which is closest to 198 × 71? (Round each number first.) (a) 140000 (b) 14000 (c) 28000 (d) 1400
  16. 16.Which is closest to 296 × 18? (Round each number first.) (a) 6000 (b) 12000 (c) 600 (d) 60000
  17. 17.Round 10.72 to one decimal place. =
  18. 18.Round 83564 to the nearest hundred.
  19. 19.Round 97.72 to one decimal place. =
  20. 20.Round 32529 to the nearest hundred.
  21. 21.Round 77044 to the nearest thousand.
  22. 22.Round 6719 to the nearest hundred.
  23. 23.Which is closest to 896 × 30? (Round each number first.) (a) 54000 (b) 270000 (c) 27000 (d) 2700
  24. 24.Round 33.22 to one decimal place. =
  25. 25.Which is closest to 897 × 80? (Round each number first.) (a) 144000 (b) 720000 (c) 7200 (d) 72000
  26. 26.Which is closest to 1997 ÷ 49? (a) 400 (b) 20 (c) 80 (d) 40
  27. 27.Round 19.59 to one decimal place. =
  28. 28.Which is closest to 904 × 58? (Round each number first.) (a) 108000 (b) 540000 (c) 5400 (d) 54000
  29. 29.Which is closest to 1495 ÷ 49? (a) 30 (b) 300 (c) 60 (d) 15
  30. 30.Round 16.64 to one decimal place. =
  31. 31.Round 12202 to the nearest ten.
  32. 32.Which is closest to 599 × 30? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  33. 33.Round 65037 to the nearest ten.
  34. 34.Round 49.41 to one decimal place. =
  35. 35.Which is closest to 499 × 28? (Round each number first.) (a) 150000 (b) 15000 (c) 30000 (d) 1500
  36. 36.Which is closest to 799 × 48? (Round each number first.) (a) 40000 (b) 400000 (c) 4000 (d) 80000
  37. 37.Round 66.18 to one decimal place. =
  38. 38.Which is closest to 597 + 699 + 303? (a) 1500 (b) 1600 (c) 1700 (d) 1800
  39. 39.Which is closest to 404 + 300 + 499? (a) 1100 (b) 1200 (c) 1400 (d) 1300
  40. 40.Round 41856 to the nearest hundred.

Answer key

  1. 1100
  2. 70
  3. 1300
  4. 61000
  5. 35.1
  6. 27.4
  7. 600
  8. 1900
  9. 19.8
  10. 24000
  11. 10000
  12. 12000
  13. 75.5
  14. 28000
  15. 14000
  16. 6000
  17. 10.7
  18. 83600
  19. 97.7
  20. 32500
  21. 77000
  22. 6700
  23. 27000
  24. 33.2
  25. 72000
  26. 40
  27. 19.6
  28. 54000
  29. 30
  30. 16.6
  31. 12200
  32. 18000
  33. 65040
  34. 49.4
  35. 15000
  36. 40000
  37. 66.2
  38. 1600
  39. 1200
  40. 41900

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