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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 841 · 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 27.33 to one decimal place. =
  2. 2.Round 21745 to the nearest thousand.
  3. 3.Which is closest to 105 + 500 + 295? (a) 800 (b) 1100 (c) 900 (d) 1000
  4. 4.Round 49.79 to one decimal place. =
  5. 5.Which is closest to 95 + 204 + 697? (a) 1200 (b) 1000 (c) 1100 (d) 900
  6. 6.Which is closest to 4501 ÷ 49? (a) 900 (b) 180 (c) 45 (d) 90
  7. 7.Round 23.14 to one decimal place. =
  8. 8.Round 94.93 to one decimal place. =
  9. 9.Which is closest to 404 × 59? (Round each number first.) (a) 24000 (b) 240000 (c) 48000 (d) 2400
  10. 10.Which is closest to 1498 ÷ 29? (a) 500 (b) 100 (c) 50 (d) 25
  11. 11.Which is closest to 900 + 197 + 98? (a) 1100 (b) 1400 (c) 1300 (d) 1200
  12. 12.Round 85.46 to one decimal place. =
  13. 13.Round 24820 to the nearest thousand.
  14. 14.Which is closest to 2402 ÷ 39? (a) 600 (b) 60 (c) 30 (d) 120
  15. 15.Which is closest to 98 + 902 + 896? (a) 1800 (b) 2100 (c) 1900 (d) 2000
  16. 16.Which is closest to 297 × 89? (Round each number first.) (a) 54000 (b) 27000 (c) 2700 (d) 270000
  17. 17.Round 46335 to the nearest hundred.
  18. 18.Which is closest to 797 × 50? (Round each number first.) (a) 80000 (b) 40000 (c) 4000 (d) 400000
  19. 19.Round 91.51 to one decimal place. =
  20. 20.Round 74.49 to one decimal place. =
  21. 21.Which is closest to 1499 ÷ 51? (a) 300 (b) 60 (c) 15 (d) 30
  22. 22.Round 80.14 to one decimal place. =
  23. 23.Which is closest to 302 × 72? (Round each number first.) (a) 2100 (b) 21000 (c) 42000 (d) 210000
  24. 24.Which is closest to 197 + 203 + 198? (a) 600 (b) 500 (c) 700 (d) 800
  25. 25.Which is closest to 300 × 48? (Round each number first.) (a) 150000 (b) 1500 (c) 30000 (d) 15000
  26. 26.Which is closest to 799 × 58? (Round each number first.) (a) 96000 (b) 480000 (c) 4800 (d) 48000
  27. 27.Which is closest to 295 + 495 + 595? (a) 1500 (b) 1600 (c) 1300 (d) 1400
  28. 28.Which is closest to 199 + 405 + 204? (a) 800 (b) 1000 (c) 700 (d) 900
  29. 29.Round 83060 to the nearest hundred.
  30. 30.Which is closest to 398 + 602 + 101? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  31. 31.Which is closest to 704 + 803 + 702? (a) 2300 (b) 2100 (c) 2200 (d) 2400
  32. 32.Which is closest to 399 + 295 + 204? (a) 1100 (b) 800 (c) 900 (d) 1000
  33. 33.Round 43534 to the nearest ten.
  34. 34.Which is closest to 399 × 18? (Round each number first.) (a) 800 (b) 80000 (c) 16000 (d) 8000
  35. 35.Round 45906 to the nearest hundred.
  36. 36.Round 90.28 to one decimal place. =
  37. 37.Which is closest to 902 × 32? (Round each number first.) (a) 54000 (b) 270000 (c) 2700 (d) 27000
  38. 38.Which is closest to 700 + 502 + 696? (a) 1800 (b) 2100 (c) 1900 (d) 2000
  39. 39.Which is closest to 295 + 895 + 404? (a) 1700 (b) 1600 (c) 1800 (d) 1500
  40. 40.Round 40.51 to one decimal place. =

Answer key

  1. 27.3
  2. 22000
  3. 900
  4. 49.8
  5. 1000
  6. 90
  7. 23.1
  8. 94.9
  9. 24000
  10. 50
  11. 1200
  12. 85.5
  13. 25000
  14. 60
  15. 1900
  16. 27000
  17. 46300
  18. 40000
  19. 91.5
  20. 74.5
  21. 30
  22. 80.1
  23. 21000
  24. 600
  25. 15000
  26. 48000
  27. 1400
  28. 800
  29. 83100
  30. 1100
  31. 2200
  32. 900
  33. 43530
  34. 8000
  35. 45900
  36. 90.3
  37. 27000
  38. 1900
  39. 1600
  40. 40.5

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