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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 230 · 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 97 + 804 + 801? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  2. 2.Which is closest to 301 × 82? (Round each number first.) (a) 48000 (b) 240000 (c) 24000 (d) 2400
  3. 3.Which is closest to 204 + 905 + 701? (a) 1700 (b) 2000 (c) 1900 (d) 1800
  4. 4.Round 88.59 to one decimal place. =
  5. 5.Which is closest to 1597 ÷ 41? (a) 400 (b) 20 (c) 40 (d) 80
  6. 6.Which is closest to 295 + 397 + 100? (a) 800 (b) 900 (c) 700 (d) 1000
  7. 7.Which is closest to 196 × 19? (Round each number first.) (a) 40000 (b) 4000 (c) 8000 (d) 400
  8. 8.Round 17.09 to one decimal place. =
  9. 9.Which is closest to 96 + 300 + 196? (a) 600 (b) 500 (c) 700 (d) 800
  10. 10.Which is closest to 397 × 88? (Round each number first.) (a) 72000 (b) 36000 (c) 360000 (d) 3600
  11. 11.Which is closest to 196 × 32? (Round each number first.) (a) 600 (b) 60000 (c) 12000 (d) 6000
  12. 12.Which is closest to 398 ÷ 21? (a) 10 (b) 200 (c) 40 (d) 20
  13. 13.Which is closest to 805 ÷ 19? (a) 20 (b) 80 (c) 40 (d) 400
  14. 14.Round 52338 to the nearest ten.
  15. 15.Which is closest to 298 × 59? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
  16. 16.Which is closest to 198 × 52? (Round each number first.) (a) 1000 (b) 20000 (c) 100000 (d) 10000
  17. 17.Which is closest to 1203 ÷ 19? (a) 600 (b) 60 (c) 120 (d) 30
  18. 18.Which is closest to 909 ÷ 29? (a) 300 (b) 60 (c) 30 (d) 15
  19. 19.Round 31245 to the nearest hundred.
  20. 20.Which is closest to 200 + 601 + 498? (a) 1400 (b) 1200 (c) 1300 (d) 1500
  21. 21.Which is closest to 199 × 40? (Round each number first.) (a) 16000 (b) 800 (c) 80000 (d) 8000
  22. 22.Round 88236 to the nearest hundred.
  23. 23.Which is closest to 1392 ÷ 19? (a) 140 (b) 70 (c) 35 (d) 700
  24. 24.Round 29.94 to one decimal place. =
  25. 25.Which is closest to 699 + 198 + 605? (a) 1600 (b) 1700 (c) 1400 (d) 1500
  26. 26.Which is closest to 302 + 698 + 202? (a) 1400 (b) 1200 (c) 1100 (d) 1300
  27. 27.Which is closest to 597 + 203 + 397? (a) 1400 (b) 1300 (c) 1100 (d) 1200
  28. 28.Which is closest to 601 + 803 + 97? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  29. 29.Which is closest to 302 × 81? (Round each number first.) (a) 24000 (b) 48000 (c) 240000 (d) 2400
  30. 30.Which is closest to 495 + 697 + 804? (a) 2000 (b) 2100 (c) 2200 (d) 1900
  31. 31.Which is closest to 397 × 18? (Round each number first.) (a) 80000 (b) 16000 (c) 800 (d) 8000
  32. 32.Which is closest to 596 + 599 + 805? (a) 2200 (b) 1900 (c) 2100 (d) 2000
  33. 33.Round 80.57 to one decimal place. =
  34. 34.Round 99.12 to one decimal place. =
  35. 35.Round 89.37 to one decimal place. =
  36. 36.Round 54016 to the nearest ten.
  37. 37.Which is closest to 801 ÷ 21? (a) 20 (b) 400 (c) 80 (d) 40
  38. 38.Round 74.67 to one decimal place. =
  39. 39.Round 33068 to the nearest ten.
  40. 40.Which is closest to 804 × 70? (Round each number first.) (a) 5600 (b) 112000 (c) 560000 (d) 56000

Answer key

  1. 1700
  2. 24000
  3. 1800
  4. 88.6
  5. 40
  6. 800
  7. 4000
  8. 17.1
  9. 600
  10. 36000
  11. 6000
  12. 20
  13. 40
  14. 52340
  15. 18000
  16. 10000
  17. 60
  18. 30
  19. 31200
  20. 1300
  21. 8000
  22. 88200
  23. 70
  24. 29.9
  25. 1500
  26. 1200
  27. 1200
  28. 1500
  29. 24000
  30. 2000
  31. 8000
  32. 2000
  33. 80.6
  34. 99.1
  35. 89.4
  36. 54020
  37. 40
  38. 74.7
  39. 33070
  40. 56000

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