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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 87 · 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 597 + 503 + 599? (a) 1800 (b) 1900 (c) 1700 (d) 1600
  2. 2.Round 11161 to the nearest thousand.
  3. 3.Round 33.43 to one decimal place. =
  4. 4.Which is closest to 499 × 32? (Round each number first.) (a) 150000 (b) 1500 (c) 15000 (d) 30000
  5. 5.Which is closest to 302 + 702 + 201? (a) 1100 (b) 1300 (c) 1200 (d) 1400
  6. 6.Which is closest to 3601 ÷ 41? (a) 45 (b) 180 (c) 900 (d) 90
  7. 7.Which is closest to 1806 ÷ 21? (a) 180 (b) 900 (c) 45 (d) 90
  8. 8.Which is closest to 698 × 20? (Round each number first.) (a) 140000 (b) 1400 (c) 28000 (d) 14000
  9. 9.Which is closest to 2098 ÷ 29? (a) 70 (b) 140 (c) 700 (d) 35
  10. 10.Round 77.37 to one decimal place. =
  11. 11.Round 27.58 to one decimal place. =
  12. 12.Round 26644 to the nearest ten.
  13. 13.Which is closest to 701 × 30? (Round each number first.) (a) 42000 (b) 210000 (c) 2100 (d) 21000
  14. 14.Round 54929 to the nearest hundred.
  15. 15.Round 58045 to the nearest thousand.
  16. 16.Which is closest to 3600 ÷ 41? (a) 180 (b) 90 (c) 45 (d) 900
  17. 17.Which is closest to 1393 ÷ 19? (a) 140 (b) 700 (c) 35 (d) 70
  18. 18.Which is closest to 201 × 62? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  19. 19.Round 2210 to the nearest thousand.
  20. 20.Which is closest to 302 × 68? (Round each number first.) (a) 2100 (b) 21000 (c) 210000 (d) 42000
  21. 21.Which is closest to 898 + 397 + 695? (a) 2100 (b) 1900 (c) 2000 (d) 2200
  22. 22.Which is closest to 1606 ÷ 21? (a) 40 (b) 800 (c) 160 (d) 80
  23. 23.Round 44.84 to one decimal place. =
  24. 24.Which is closest to 1995 ÷ 39? (a) 25 (b) 100 (c) 500 (d) 50
  25. 25.Which is closest to 594 ÷ 21? (a) 300 (b) 60 (c) 30 (d) 15
  26. 26.Which is closest to 197 × 22? (Round each number first.) (a) 40000 (b) 4000 (c) 400 (d) 8000
  27. 27.Which is closest to 298 × 81? (Round each number first.) (a) 2400 (b) 48000 (c) 240000 (d) 24000
  28. 28.Which is closest to 597 × 32? (Round each number first.) (a) 1800 (b) 36000 (c) 18000 (d) 180000
  29. 29.Which is closest to 598 + 904 + 297? (a) 1900 (b) 1700 (c) 1800 (d) 2000
  30. 30.Which is closest to 396 + 602 + 495? (a) 1400 (b) 1700 (c) 1500 (d) 1600
  31. 31.Which is closest to 791 ÷ 41? (a) 20 (b) 10 (c) 200 (d) 40
  32. 32.Which is closest to 793 ÷ 39? (a) 10 (b) 20 (c) 40 (d) 200
  33. 33.Which is closest to 596 × 39? (Round each number first.) (a) 24000 (b) 240000 (c) 48000 (d) 2400
  34. 34.Round 30.48 to one decimal place. =
  35. 35.Round 96769 to the nearest thousand.
  36. 36.Round 40234 to the nearest hundred.
  37. 37.Which is closest to 1496 ÷ 51? (a) 60 (b) 300 (c) 15 (d) 30
  38. 38.Which is closest to 698 × 32? (Round each number first.) (a) 210000 (b) 42000 (c) 2100 (d) 21000
  39. 39.Which is closest to 496 × 22? (Round each number first.) (a) 10000 (b) 100000 (c) 1000 (d) 20000
  40. 40.Which is closest to 796 × 69? (Round each number first.) (a) 5600 (b) 56000 (c) 560000 (d) 112000

Answer key

  1. 1700
  2. 11000
  3. 33.4
  4. 15000
  5. 1200
  6. 90
  7. 90
  8. 14000
  9. 70
  10. 77.4
  11. 27.6
  12. 26640
  13. 21000
  14. 54900
  15. 58000
  16. 90
  17. 70
  18. 12000
  19. 2000
  20. 21000
  21. 2000
  22. 80
  23. 44.8
  24. 50
  25. 30
  26. 4000
  27. 24000
  28. 18000
  29. 1800
  30. 1500
  31. 20
  32. 20
  33. 24000
  34. 30.5
  35. 97000
  36. 40200
  37. 30
  38. 21000
  39. 10000
  40. 56000

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