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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 454 · 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 598 × 88? (Round each number first.) (a) 108000 (b) 5400 (c) 540000 (d) 54000
  2. 2.Which is closest to 898 × 49? (Round each number first.) (a) 45000 (b) 450000 (c) 4500 (d) 90000
  3. 3.Which is closest to 795 ÷ 41? (a) 40 (b) 10 (c) 20 (d) 200
  4. 4.Which is closest to 901 × 22? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  5. 5.Round 22.48 to one decimal place. =
  6. 6.Round 62057 to the nearest hundred.
  7. 7.Which is closest to 2403 ÷ 39? (a) 120 (b) 30 (c) 600 (d) 60
  8. 8.Round 17729 to the nearest hundred.
  9. 9.Which is closest to 398 × 69? (Round each number first.) (a) 56000 (b) 2800 (c) 280000 (d) 28000
  10. 10.Which is closest to 801 × 50? (Round each number first.) (a) 4000 (b) 400000 (c) 40000 (d) 80000
  11. 11.Which is closest to 303 × 72? (Round each number first.) (a) 42000 (b) 210000 (c) 21000 (d) 2100
  12. 12.Which is closest to 1594 ÷ 41? (a) 400 (b) 20 (c) 80 (d) 40
  13. 13.Round 29.87 to one decimal place. =
  14. 14.Which is closest to 803 × 20? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
  15. 15.Which is closest to 202 × 20? (Round each number first.) (a) 8000 (b) 40000 (c) 4000 (d) 400
  16. 16.Which is closest to 297 + 496 + 703? (a) 1400 (b) 1600 (c) 1700 (d) 1500
  17. 17.Which is closest to 204 + 596 + 205? (a) 1200 (b) 1000 (c) 1100 (d) 900
  18. 18.Round 56.92 to one decimal place. =
  19. 19.Round 43682 to the nearest thousand.
  20. 20.Round 76971 to the nearest thousand.
  21. 21.Round 29.39 to one decimal place. =
  22. 22.Round 97.26 to one decimal place. =
  23. 23.Which is closest to 1204 ÷ 31? (a) 20 (b) 80 (c) 40 (d) 400
  24. 24.Which is closest to 895 + 701 + 103? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  25. 25.Round 2716 to the nearest thousand.
  26. 26.Which is closest to 1597 ÷ 41? (a) 80 (b) 40 (c) 400 (d) 20
  27. 27.Round 68.77 to one decimal place. =
  28. 28.Which is closest to 703 + 804 + 803? (a) 2300 (b) 2200 (c) 2400 (d) 2500
  29. 29.Round 67.57 to one decimal place. =
  30. 30.Which is closest to 1796 ÷ 19? (a) 180 (b) 900 (c) 45 (d) 90
  31. 31.Round 20.21 to one decimal place. =
  32. 32.Which is closest to 906 ÷ 29? (a) 15 (b) 60 (c) 30 (d) 300
  33. 33.Round 98.77 to one decimal place. =
  34. 34.Which is closest to 1502 ÷ 49? (a) 15 (b) 30 (c) 300 (d) 60
  35. 35.Which is closest to 701 + 99 + 98? (a) 1100 (b) 900 (c) 1000 (d) 800
  36. 36.Round 39.93 to one decimal place. =
  37. 37.Round 56.07 to one decimal place. =
  38. 38.Round 76.39 to one decimal place. =
  39. 39.Which is closest to 396 × 19? (Round each number first.) (a) 80000 (b) 16000 (c) 800 (d) 8000
  40. 40.Which is closest to 401 ÷ 21? (a) 10 (b) 40 (c) 20 (d) 200

Answer key

  1. 54000
  2. 45000
  3. 20
  4. 18000
  5. 22.5
  6. 62100
  7. 60
  8. 17700
  9. 28000
  10. 40000
  11. 21000
  12. 40
  13. 29.9
  14. 16000
  15. 4000
  16. 1500
  17. 1000
  18. 56.9
  19. 44000
  20. 77000
  21. 29.4
  22. 97.3
  23. 40
  24. 1700
  25. 3000
  26. 40
  27. 68.8
  28. 2300
  29. 67.6
  30. 90
  31. 20.2
  32. 30
  33. 98.8
  34. 30
  35. 900
  36. 39.9
  37. 56.1
  38. 76.4
  39. 8000
  40. 20

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