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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 766 · 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 16799 to the nearest thousand.
  2. 2.Round 23.16 to one decimal place. =
  3. 3.Which is closest to 303 × 49? (Round each number first.) (a) 15000 (b) 30000 (c) 1500 (d) 150000
  4. 4.Which is closest to 699 × 30? (Round each number first.) (a) 210000 (b) 42000 (c) 2100 (d) 21000
  5. 5.Round 86.48 to one decimal place. =
  6. 6.Round 28.78 to one decimal place. =
  7. 7.Which is closest to 897 + 702 + 503? (a) 2200 (b) 2000 (c) 2100 (d) 2300
  8. 8.Round 6440 to the nearest hundred.
  9. 9.Which is closest to 501 + 398 + 601? (a) 1500 (b) 1600 (c) 1400 (d) 1700
  10. 10.Round 44208 to the nearest ten.
  11. 11.Which is closest to 405 + 900 + 303? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  12. 12.Which is closest to 2006 ÷ 41? (a) 500 (b) 50 (c) 100 (d) 25
  13. 13.Round 80674 to the nearest thousand.
  14. 14.Which is closest to 201 × 71? (Round each number first.) (a) 140000 (b) 28000 (c) 1400 (d) 14000
  15. 15.Which is closest to 298 × 30? (Round each number first.) (a) 18000 (b) 90000 (c) 9000 (d) 900
  16. 16.Which is closest to 101 + 695 + 602? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  17. 17.Round 55.92 to one decimal place. =
  18. 18.Which is closest to 203 + 796 + 395? (a) 1400 (b) 1600 (c) 1300 (d) 1500
  19. 19.Round 71058 to the nearest thousand.
  20. 20.Which is closest to 496 × 91? (Round each number first.) (a) 450000 (b) 4500 (c) 45000 (d) 90000
  21. 21.Which is closest to 197 × 18? (Round each number first.) (a) 40000 (b) 400 (c) 8000 (d) 4000
  22. 22.Round 39.46 to one decimal place. =
  23. 23.Round 18.48 to one decimal place. =
  24. 24.Which is closest to 1391 ÷ 21? (a) 700 (b) 70 (c) 140 (d) 35
  25. 25.Round 65.66 to one decimal place. =
  26. 26.Round 85.31 to one decimal place. =
  27. 27.Which is closest to 701 × 61? (Round each number first.) (a) 84000 (b) 420000 (c) 42000 (d) 4200
  28. 28.Which is closest to 3597 ÷ 39? (a) 90 (b) 45 (c) 900 (d) 180
  29. 29.Which is closest to 196 + 203 + 403? (a) 1000 (b) 800 (c) 700 (d) 900
  30. 30.Round 41455 to the nearest thousand.
  31. 31.Round 28.58 to one decimal place. =
  32. 32.Which is closest to 397 + 603 + 600? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  33. 33.Round 18794 to the nearest hundred.
  34. 34.Round 30.73 to one decimal place. =
  35. 35.Round 79.68 to one decimal place. =
  36. 36.Which is closest to 595 + 500 + 197? (a) 1400 (b) 1200 (c) 1300 (d) 1500
  37. 37.Which is closest to 398 × 90? (Round each number first.) (a) 72000 (b) 3600 (c) 36000 (d) 360000
  38. 38.Which is closest to 395 + 902 + 905? (a) 2300 (b) 2100 (c) 2400 (d) 2200
  39. 39.Round 71.86 to one decimal place. =
  40. 40.Which is closest to 1205 ÷ 31? (a) 400 (b) 80 (c) 40 (d) 20

Answer key

  1. 17000
  2. 23.2
  3. 15000
  4. 21000
  5. 86.5
  6. 28.8
  7. 2100
  8. 6400
  9. 1500
  10. 44210
  11. 1600
  12. 50
  13. 81000
  14. 14000
  15. 9000
  16. 1400
  17. 55.9
  18. 1400
  19. 71000
  20. 45000
  21. 4000
  22. 39.5
  23. 18.5
  24. 70
  25. 65.7
  26. 85.3
  27. 42000
  28. 90
  29. 800
  30. 41000
  31. 28.6
  32. 1600
  33. 18800
  34. 30.7
  35. 79.7
  36. 1300
  37. 36000
  38. 2200
  39. 71.9
  40. 40

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