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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 585 · 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 41398 to the nearest hundred.
  2. 2.Which is closest to 809 ÷ 39? (a) 20 (b) 40 (c) 200 (d) 10
  3. 3.Round 73.63 to one decimal place. =
  4. 4.Which is closest to 300 + 200 + 397? (a) 900 (b) 800 (c) 1100 (d) 1000
  5. 5.Which is closest to 497 × 62? (Round each number first.) (a) 60000 (b) 300000 (c) 3000 (d) 30000
  6. 6.Round 12671 to the nearest ten.
  7. 7.Which is closest to 897 × 28? (Round each number first.) (a) 270000 (b) 2700 (c) 27000 (d) 54000
  8. 8.Which is closest to 402 + 397 + 302? (a) 1000 (b) 1200 (c) 1100 (d) 1300
  9. 9.Round 67407 to the nearest thousand.
  10. 10.Round 18801 to the nearest hundred.
  11. 11.Which is closest to 1804 ÷ 21? (a) 180 (b) 90 (c) 45 (d) 900
  12. 12.Round 87.71 to one decimal place. =
  13. 13.Round 75.94 to one decimal place. =
  14. 14.Which is closest to 994 ÷ 51? (a) 40 (b) 200 (c) 20 (d) 10
  15. 15.Which is closest to 500 + 897 + 898? (a) 2200 (b) 2500 (c) 2400 (d) 2300
  16. 16.Round 42.76 to one decimal place. =
  17. 17.Round 19349 to the nearest ten.
  18. 18.Which is closest to 296 × 89? (Round each number first.) (a) 2700 (b) 54000 (c) 270000 (d) 27000
  19. 19.Which is closest to 396 × 40? (Round each number first.) (a) 1600 (b) 16000 (c) 160000 (d) 32000
  20. 20.Which is closest to 297 × 40? (Round each number first.) (a) 24000 (b) 120000 (c) 1200 (d) 12000
  21. 21.Round 20.52 to one decimal place. =
  22. 22.Which is closest to 498 × 18? (Round each number first.) (a) 20000 (b) 10000 (c) 1000 (d) 100000
  23. 23.Round 14.78 to one decimal place. =
  24. 24.Round 54.31 to one decimal place. =
  25. 25.Round 76409 to the nearest ten.
  26. 26.Which is closest to 798 × 19? (Round each number first.) (a) 1600 (b) 160000 (c) 16000 (d) 32000
  27. 27.Which is closest to 297 + 195 + 496? (a) 1000 (b) 1200 (c) 1100 (d) 900
  28. 28.Which is closest to 1398 ÷ 21? (a) 140 (b) 35 (c) 700 (d) 70
  29. 29.Which is closest to 504 + 99 + 800? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  30. 30.Round 69.74 to one decimal place. =
  31. 31.Which is closest to 808 ÷ 41? (a) 40 (b) 20 (c) 10 (d) 200
  32. 32.Round 33.07 to one decimal place. =
  33. 33.Round 59.23 to one decimal place. =
  34. 34.Round 93.32 to one decimal place. =
  35. 35.Round 27390 to the nearest hundred.
  36. 36.Which is closest to 204 × 30? (Round each number first.) (a) 60000 (b) 600 (c) 6000 (d) 12000
  37. 37.Which is closest to 295 + 104 + 400? (a) 1000 (b) 700 (c) 900 (d) 800
  38. 38.Which is closest to 402 × 91? (Round each number first.) (a) 72000 (b) 360000 (c) 36000 (d) 3600
  39. 39.Which is closest to 500 + 495 + 795? (a) 2000 (b) 1800 (c) 1900 (d) 1700
  40. 40.Which is closest to 703 + 99 + 801? (a) 1800 (b) 1600 (c) 1700 (d) 1500

Answer key

  1. 41400
  2. 20
  3. 73.6
  4. 900
  5. 30000
  6. 12670
  7. 27000
  8. 1100
  9. 67000
  10. 18800
  11. 90
  12. 87.7
  13. 75.9
  14. 20
  15. 2300
  16. 42.8
  17. 19350
  18. 27000
  19. 16000
  20. 12000
  21. 20.5
  22. 10000
  23. 14.8
  24. 54.3
  25. 76410
  26. 16000
  27. 1000
  28. 70
  29. 1400
  30. 69.7
  31. 20
  32. 33.1
  33. 59.2
  34. 93.3
  35. 27400
  36. 6000
  37. 800
  38. 36000
  39. 1800
  40. 1600

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