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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 162 · 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 602 × 32? (Round each number first.) (a) 36000 (b) 180000 (c) 18000 (d) 1800
  2. 2.Round 56.59 to one decimal place. =
  3. 3.Which is closest to 200 × 71? (Round each number first.) (a) 14000 (b) 140000 (c) 28000 (d) 1400
  4. 4.Round 64.06 to one decimal place. =
  5. 5.Which is closest to 597 + 501 + 501? (a) 1800 (b) 1500 (c) 1600 (d) 1700
  6. 6.Which is closest to 597 + 400 + 101? (a) 1300 (b) 1100 (c) 1000 (d) 1200
  7. 7.Which is closest to 1992 ÷ 49? (a) 40 (b) 400 (c) 20 (d) 80
  8. 8.Which is closest to 3508 ÷ 51? (a) 140 (b) 70 (c) 700 (d) 35
  9. 9.Which is closest to 204 × 39? (Round each number first.) (a) 80000 (b) 16000 (c) 800 (d) 8000
  10. 10.Round 69113 to the nearest hundred.
  11. 11.Which is closest to 199 + 105 + 795? (a) 1200 (b) 1300 (c) 1000 (d) 1100
  12. 12.Round 29.73 to one decimal place. =
  13. 13.Which is closest to 101 + 203 + 600? (a) 900 (b) 1000 (c) 1100 (d) 800
  14. 14.Round 59.71 to one decimal place. =
  15. 15.Round 72264 to the nearest hundred.
  16. 16.Which is closest to 399 × 71? (Round each number first.) (a) 28000 (b) 56000 (c) 2800 (d) 280000
  17. 17.Round 93827 to the nearest ten.
  18. 18.Which is closest to 203 × 92? (Round each number first.) (a) 18000 (b) 180000 (c) 1800 (d) 36000
  19. 19.Round 5536 to the nearest hundred.
  20. 20.Which is closest to 503 × 39? (Round each number first.) (a) 2000 (b) 200000 (c) 20000 (d) 40000
  21. 21.Round 30485 to the nearest hundred.
  22. 22.Round 17.71 to one decimal place. =
  23. 23.Round 83153 to the nearest ten.
  24. 24.Round 74705 to the nearest hundred.
  25. 25.Which is closest to 1400 ÷ 21? (a) 35 (b) 140 (c) 700 (d) 70
  26. 26.Round 91569 to the nearest ten.
  27. 27.Round 20.34 to one decimal place. =
  28. 28.Which is closest to 697 + 595 + 203? (a) 1500 (b) 1700 (c) 1600 (d) 1400
  29. 29.Round 19503 to the nearest hundred.
  30. 30.Which is closest to 3597 ÷ 41? (a) 180 (b) 45 (c) 90 (d) 900
  31. 31.Which is closest to 204 + 796 + 499? (a) 1600 (b) 1500 (c) 1400 (d) 1700
  32. 32.Round 17110 to the nearest hundred.
  33. 33.Which is closest to 2494 ÷ 49? (a) 25 (b) 500 (c) 100 (d) 50
  34. 34.Which is closest to 697 + 501 + 705? (a) 2000 (b) 1900 (c) 2100 (d) 1800
  35. 35.Round 41.92 to one decimal place. =
  36. 36.Round 38.64 to one decimal place. =
  37. 37.Which is closest to 497 × 69? (Round each number first.) (a) 70000 (b) 35000 (c) 350000 (d) 3500
  38. 38.Round 42.67 to one decimal place. =
  39. 39.Which is closest to 97 + 703 + 501? (a) 1500 (b) 1200 (c) 1400 (d) 1300
  40. 40.Which is closest to 497 × 50? (Round each number first.) (a) 2500 (b) 25000 (c) 250000 (d) 50000

Answer key

  1. 18000
  2. 56.6
  3. 14000
  4. 64.1
  5. 1600
  6. 1100
  7. 40
  8. 70
  9. 8000
  10. 69100
  11. 1100
  12. 29.7
  13. 900
  14. 59.7
  15. 72300
  16. 28000
  17. 93830
  18. 18000
  19. 5500
  20. 20000
  21. 30500
  22. 17.7
  23. 83150
  24. 74700
  25. 70
  26. 91570
  27. 20.3
  28. 1500
  29. 19500
  30. 90
  31. 1500
  32. 17100
  33. 50
  34. 1900
  35. 41.9
  36. 38.6
  37. 35000
  38. 42.7
  39. 1300
  40. 25000

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