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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 470 · 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 901 × 38? (Round each number first.) (a) 72000 (b) 36000 (c) 3600 (d) 360000
  2. 2.Which is closest to 2098 ÷ 29? (a) 140 (b) 35 (c) 70 (d) 700
  3. 3.Which is closest to 398 × 22? (Round each number first.) (a) 16000 (b) 80000 (c) 8000 (d) 800
  4. 4.Which is closest to 1598 ÷ 39? (a) 400 (b) 20 (c) 80 (d) 40
  5. 5.Round 50.52 to one decimal place. =
  6. 6.Which is closest to 297 + 796 + 495? (a) 1800 (b) 1700 (c) 1500 (d) 1600
  7. 7.Round 85.37 to one decimal place. =
  8. 8.Which is closest to 204 × 52? (Round each number first.) (a) 100000 (b) 20000 (c) 1000 (d) 10000
  9. 9.Round 22806 to the nearest ten.
  10. 10.Which is closest to 197 × 32? (Round each number first.) (a) 60000 (b) 12000 (c) 600 (d) 6000
  11. 11.Round 69723 to the nearest hundred.
  12. 12.Which is closest to 591 ÷ 29? (a) 10 (b) 20 (c) 200 (d) 40
  13. 13.Round 98.58 to one decimal place. =
  14. 14.Round 81.47 to one decimal place. =
  15. 15.Round 84.91 to one decimal place. =
  16. 16.Which is closest to 302 + 204 + 602? (a) 1300 (b) 1100 (c) 1200 (d) 1000
  17. 17.Round 30112 to the nearest hundred.
  18. 18.Which is closest to 701 + 299 + 97? (a) 1000 (b) 1100 (c) 1200 (d) 1300
  19. 19.Round 69243 to the nearest thousand.
  20. 20.Which is closest to 898 × 31? (Round each number first.) (a) 2700 (b) 270000 (c) 27000 (d) 54000
  21. 21.Which is closest to 97 + 298 + 303? (a) 700 (b) 900 (c) 800 (d) 600
  22. 22.Round 80997 to the nearest ten.
  23. 23.Which is closest to 499 + 203 + 105? (a) 700 (b) 900 (c) 1000 (d) 800
  24. 24.Which is closest to 994 ÷ 49? (a) 200 (b) 40 (c) 20 (d) 10
  25. 25.Round 98278 to the nearest thousand.
  26. 26.Which is closest to 803 + 301 + 99? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  27. 27.Which is closest to 499 × 32? (Round each number first.) (a) 1500 (b) 30000 (c) 150000 (d) 15000
  28. 28.Which is closest to 295 + 100 + 97? (a) 400 (b) 700 (c) 600 (d) 500
  29. 29.Which is closest to 705 + 505 + 498? (a) 1700 (b) 1800 (c) 1600 (d) 1900
  30. 30.Which is closest to 899 ÷ 29? (a) 60 (b) 15 (c) 300 (d) 30
  31. 31.Which is closest to 197 + 200 + 905? (a) 1200 (b) 1300 (c) 1500 (d) 1400
  32. 32.Round 21.27 to one decimal place. =
  33. 33.Round 95.41 to one decimal place. =
  34. 34.Round 36.13 to one decimal place. =
  35. 35.Which is closest to 599 × 89? (Round each number first.) (a) 5400 (b) 540000 (c) 54000 (d) 108000
  36. 36.Round 15.58 to one decimal place. =
  37. 37.Round 70928 to the nearest ten.
  38. 38.Round 66858 to the nearest thousand.
  39. 39.Which is closest to 597 ÷ 21? (a) 300 (b) 15 (c) 60 (d) 30
  40. 40.Round 24023 to the nearest ten.

Answer key

  1. 36000
  2. 70
  3. 8000
  4. 40
  5. 50.5
  6. 1600
  7. 85.4
  8. 10000
  9. 22810
  10. 6000
  11. 69700
  12. 20
  13. 98.6
  14. 81.5
  15. 84.9
  16. 1100
  17. 30100
  18. 1100
  19. 69000
  20. 27000
  21. 700
  22. 81000
  23. 800
  24. 20
  25. 98000
  26. 1200
  27. 15000
  28. 500
  29. 1700
  30. 30
  31. 1300
  32. 21.3
  33. 95.4
  34. 36.1
  35. 54000
  36. 15.6
  37. 70930
  38. 67000
  39. 30
  40. 24020

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