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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 752 · 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 300 + 695 + 896? (a) 1800 (b) 2000 (c) 2100 (d) 1900
  2. 2.Round 29311 to the nearest ten.
  3. 3.Round 10.64 to one decimal place. =
  4. 4.Round 20001 to the nearest hundred.
  5. 5.Which is closest to 304 × 49? (Round each number first.) (a) 150000 (b) 1500 (c) 15000 (d) 30000
  6. 6.Which is closest to 304 × 39? (Round each number first.) (a) 12000 (b) 24000 (c) 120000 (d) 1200
  7. 7.Which is closest to 195 + 98 + 504? (a) 800 (b) 1000 (c) 900 (d) 700
  8. 8.Which is closest to 409 ÷ 19? (a) 10 (b) 200 (c) 20 (d) 40
  9. 9.Which is closest to 698 + 500 + 904? (a) 2300 (b) 2000 (c) 2200 (d) 2100
  10. 10.Round 36.24 to one decimal place. =
  11. 11.Round 39.73 to one decimal place. =
  12. 12.Round 87668 to the nearest ten.
  13. 13.Round 76.94 to one decimal place. =
  14. 14.Round 52.52 to one decimal place. =
  15. 15.Which is closest to 397 × 69? (Round each number first.) (a) 56000 (b) 2800 (c) 280000 (d) 28000
  16. 16.Which is closest to 204 × 20? (Round each number first.) (a) 8000 (b) 4000 (c) 400 (d) 40000
  17. 17.Round 65.08 to one decimal place. =
  18. 18.Which is closest to 599 × 30? (Round each number first.) (a) 180000 (b) 36000 (c) 1800 (d) 18000
  19. 19.Round 24.32 to one decimal place. =
  20. 20.Round 14.13 to one decimal place. =
  21. 21.Which is closest to 203 + 599 + 297? (a) 1000 (b) 1100 (c) 1200 (d) 1300
  22. 22.Which is closest to 792 ÷ 41? (a) 200 (b) 10 (c) 20 (d) 40
  23. 23.Which is closest to 301 × 60? (Round each number first.) (a) 180000 (b) 36000 (c) 18000 (d) 1800
  24. 24.Which is closest to 598 + 705 + 195? (a) 1500 (b) 1400 (c) 1700 (d) 1600
  25. 25.Which is closest to 4505 ÷ 49? (a) 900 (b) 180 (c) 90 (d) 45
  26. 26.Which is closest to 2808 ÷ 41? (a) 700 (b) 70 (c) 140 (d) 35
  27. 27.Which is closest to 596 ÷ 21? (a) 300 (b) 30 (c) 60 (d) 15
  28. 28.Which is closest to 97 + 101 + 796? (a) 1200 (b) 900 (c) 1000 (d) 1100
  29. 29.Which is closest to 399 + 502 + 499? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  30. 30.Which is closest to 600 + 897 + 96? (a) 1800 (b) 1700 (c) 1500 (d) 1600
  31. 31.Which is closest to 96 + 600 + 898? (a) 1500 (b) 1600 (c) 1800 (d) 1700
  32. 32.Round 58204 to the nearest hundred.
  33. 33.Which is closest to 299 × 61? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  34. 34.Round 19.73 to one decimal place. =
  35. 35.Which is closest to 2402 ÷ 31? (a) 160 (b) 40 (c) 800 (d) 80
  36. 36.Which is closest to 796 ÷ 21? (a) 80 (b) 400 (c) 40 (d) 20
  37. 37.Round 84.64 to one decimal place. =
  38. 38.Which is closest to 402 × 72? (Round each number first.) (a) 56000 (b) 28000 (c) 280000 (d) 2800
  39. 39.Which is closest to 101 + 395 + 595? (a) 1100 (b) 1000 (c) 1300 (d) 1200
  40. 40.Round 54019 to the nearest hundred.

Answer key

  1. 1900
  2. 29310
  3. 10.6
  4. 20000
  5. 15000
  6. 12000
  7. 800
  8. 20
  9. 2100
  10. 36.2
  11. 39.7
  12. 87670
  13. 76.9
  14. 52.5
  15. 28000
  16. 4000
  17. 65.1
  18. 18000
  19. 24.3
  20. 14.1
  21. 1100
  22. 20
  23. 18000
  24. 1500
  25. 90
  26. 70
  27. 30
  28. 1000
  29. 1400
  30. 1600
  31. 1600
  32. 58200
  33. 18000
  34. 19.7
  35. 80
  36. 40
  37. 84.6
  38. 28000
  39. 1100
  40. 54000

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