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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 238 · 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 603 + 304 + 96? (a) 1100 (b) 1200 (c) 900 (d) 1000
  2. 2.Round 85.77 to one decimal place. =
  3. 3.Which is closest to 597 × 32? (Round each number first.) (a) 1800 (b) 36000 (c) 180000 (d) 18000
  4. 4.Round 45765 to the nearest hundred.
  5. 5.Which is closest to 199 × 49? (Round each number first.) (a) 100000 (b) 1000 (c) 20000 (d) 10000
  6. 6.Which is closest to 697 + 299 + 899? (a) 1900 (b) 1800 (c) 2100 (d) 2000
  7. 7.Which is closest to 398 × 88? (Round each number first.) (a) 72000 (b) 3600 (c) 36000 (d) 360000
  8. 8.Which is closest to 196 + 503 + 198? (a) 1100 (b) 800 (c) 900 (d) 1000
  9. 9.Which is closest to 200 × 32? (Round each number first.) (a) 600 (b) 12000 (c) 6000 (d) 60000
  10. 10.Which is closest to 3598 ÷ 39? (a) 90 (b) 900 (c) 180 (d) 45
  11. 11.Round 59230 to the nearest hundred.
  12. 12.Which is closest to 899 + 99 + 203? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  13. 13.Which is closest to 400 × 22? (Round each number first.) (a) 16000 (b) 80000 (c) 800 (d) 8000
  14. 14.Round 54.14 to one decimal place. =
  15. 15.Which is closest to 397 × 91? (Round each number first.) (a) 72000 (b) 36000 (c) 360000 (d) 3600
  16. 16.Round 19.34 to one decimal place. =
  17. 17.Round 95252 to the nearest hundred.
  18. 18.Round 74.73 to one decimal place. =
  19. 19.Which is closest to 899 × 58? (Round each number first.) (a) 540000 (b) 108000 (c) 54000 (d) 5400
  20. 20.Which is closest to 798 × 41? (Round each number first.) (a) 32000 (b) 320000 (c) 64000 (d) 3200
  21. 21.Which is closest to 803 + 804 + 298? (a) 1800 (b) 2100 (c) 2000 (d) 1900
  22. 22.Which is closest to 702 × 51? (Round each number first.) (a) 350000 (b) 3500 (c) 70000 (d) 35000
  23. 23.Round 22362 to the nearest ten.
  24. 24.Which is closest to 700 × 88? (Round each number first.) (a) 6300 (b) 63000 (c) 630000 (d) 126000
  25. 25.Round 95801 to the nearest hundred.
  26. 26.Which is closest to 803 × 61? (Round each number first.) (a) 48000 (b) 96000 (c) 480000 (d) 4800
  27. 27.Which is closest to 1196 ÷ 21? (a) 120 (b) 30 (c) 600 (d) 60
  28. 28.Which is closest to 598 × 29? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
  29. 29.Which is closest to 3198 ÷ 39? (a) 80 (b) 160 (c) 40 (d) 800
  30. 30.Round 97.57 to one decimal place. =
  31. 31.Which is closest to 500 × 81? (Round each number first.) (a) 400000 (b) 4000 (c) 40000 (d) 80000
  32. 32.Which is closest to 1001 ÷ 51? (a) 40 (b) 200 (c) 10 (d) 20
  33. 33.Which is closest to 401 + 97 + 500? (a) 900 (b) 1100 (c) 1000 (d) 1200
  34. 34.Round 51.56 to one decimal place. =
  35. 35.Round 35.68 to one decimal place. =
  36. 36.Which is closest to 296 + 305 + 803? (a) 1600 (b) 1300 (c) 1500 (d) 1400
  37. 37.Which is closest to 303 + 899 + 499? (a) 1700 (b) 1600 (c) 1900 (d) 1800
  38. 38.Round 64.37 to one decimal place. =
  39. 39.Round 35.08 to one decimal place. =
  40. 40.Which is closest to 301 × 79? (Round each number first.) (a) 2400 (b) 48000 (c) 240000 (d) 24000

Answer key

  1. 1000
  2. 85.8
  3. 18000
  4. 45800
  5. 10000
  6. 1900
  7. 36000
  8. 900
  9. 6000
  10. 90
  11. 59200
  12. 1200
  13. 8000
  14. 54.1
  15. 36000
  16. 19.3
  17. 95300
  18. 74.7
  19. 54000
  20. 32000
  21. 1900
  22. 35000
  23. 22360
  24. 63000
  25. 95800
  26. 48000
  27. 60
  28. 18000
  29. 80
  30. 97.6
  31. 40000
  32. 20
  33. 1000
  34. 51.6
  35. 35.7
  36. 1400
  37. 1700
  38. 64.4
  39. 35.1
  40. 24000

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