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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 441 · 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 403 + 698 + 604? (a) 1600 (b) 1800 (c) 1900 (d) 1700
  2. 2.Round 84861 to the nearest ten.
  3. 3.Which is closest to 599 × 71? (Round each number first.) (a) 84000 (b) 4200 (c) 420000 (d) 42000
  4. 4.Which is closest to 608 ÷ 29? (a) 40 (b) 200 (c) 10 (d) 20
  5. 5.Which is closest to 695 + 595 + 104? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  6. 6.Which is closest to 396 × 39? (Round each number first.) (a) 16000 (b) 32000 (c) 160000 (d) 1600
  7. 7.Which is closest to 3191 ÷ 41? (a) 80 (b) 160 (c) 800 (d) 40
  8. 8.Which is closest to 1792 ÷ 31? (a) 30 (b) 120 (c) 60 (d) 600
  9. 9.Which is closest to 1508 ÷ 49? (a) 15 (b) 300 (c) 30 (d) 60
  10. 10.Round 23.72 to one decimal place. =
  11. 11.Round 29.26 to one decimal place. =
  12. 12.Which is closest to 995 ÷ 21? (a) 50 (b) 500 (c) 100 (d) 25
  13. 13.Which is closest to 2406 ÷ 41? (a) 600 (b) 60 (c) 120 (d) 30
  14. 14.Which is closest to 3498 ÷ 49? (a) 700 (b) 140 (c) 35 (d) 70
  15. 15.Which is closest to 298 × 68? (Round each number first.) (a) 42000 (b) 21000 (c) 2100 (d) 210000
  16. 16.Which is closest to 2009 ÷ 51? (a) 80 (b) 40 (c) 400 (d) 20
  17. 17.Which is closest to 595 + 495 + 396? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  18. 18.Round 45.09 to one decimal place. =
  19. 19.Which is closest to 204 × 80? (Round each number first.) (a) 32000 (b) 16000 (c) 160000 (d) 1600
  20. 20.Which is closest to 496 × 18? (Round each number first.) (a) 1000 (b) 20000 (c) 100000 (d) 10000
  21. 21.Round 3316 to the nearest ten.
  22. 22.Round 84960 to the nearest hundred.
  23. 23.Which is closest to 503 × 72? (Round each number first.) (a) 70000 (b) 3500 (c) 350000 (d) 35000
  24. 24.Round 23.52 to one decimal place. =
  25. 25.Which is closest to 2509 ÷ 51? (a) 500 (b) 25 (c) 100 (d) 50
  26. 26.Round 66.53 to one decimal place. =
  27. 27.Round 14.74 to one decimal place. =
  28. 28.Which is closest to 196 × 18? (Round each number first.) (a) 8000 (b) 400 (c) 40000 (d) 4000
  29. 29.Round 2724 to the nearest hundred.
  30. 30.Round 56.11 to one decimal place. =
  31. 31.Which is closest to 499 × 90? (Round each number first.) (a) 45000 (b) 4500 (c) 90000 (d) 450000
  32. 32.Which is closest to 793 ÷ 21? (a) 80 (b) 40 (c) 20 (d) 400
  33. 33.Which is closest to 497 + 95 + 798? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  34. 34.Which is closest to 805 + 797 + 897? (a) 2600 (b) 2500 (c) 2700 (d) 2400
  35. 35.Which is closest to 399 × 49? (Round each number first.) (a) 200000 (b) 2000 (c) 20000 (d) 40000
  36. 36.Which is closest to 396 × 89? (Round each number first.) (a) 36000 (b) 72000 (c) 3600 (d) 360000
  37. 37.Which is closest to 498 + 195 + 100? (a) 700 (b) 1000 (c) 800 (d) 900
  38. 38.Which is closest to 698 × 78? (Round each number first.) (a) 112000 (b) 560000 (c) 56000 (d) 5600
  39. 39.Round 50.32 to one decimal place. =
  40. 40.Which is closest to 297 × 18? (Round each number first.) (a) 60000 (b) 6000 (c) 12000 (d) 600

Answer key

  1. 1700
  2. 84860
  3. 42000
  4. 20
  5. 1400
  6. 16000
  7. 80
  8. 60
  9. 30
  10. 23.7
  11. 29.3
  12. 50
  13. 60
  14. 70
  15. 21000
  16. 40
  17. 1500
  18. 45.1
  19. 16000
  20. 10000
  21. 3320
  22. 85000
  23. 35000
  24. 23.5
  25. 50
  26. 66.5
  27. 14.7
  28. 4000
  29. 2700
  30. 56.1
  31. 45000
  32. 40
  33. 1400
  34. 2500
  35. 20000
  36. 36000
  37. 800
  38. 56000
  39. 50.3
  40. 6000

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