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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 520 · 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 + 898 + 904? (a) 2300 (b) 2600 (c) 2400 (d) 2500
  2. 2.Which is closest to 302 × 19? (Round each number first.) (a) 60000 (b) 600 (c) 6000 (d) 12000
  3. 3.Which is closest to 798 + 100 + 399? (a) 1300 (b) 1500 (c) 1200 (d) 1400
  4. 4.Round 50.17 to one decimal place. =
  5. 5.Which is closest to 495 + 105 + 105? (a) 900 (b) 600 (c) 700 (d) 800
  6. 6.Round 16827 to the nearest thousand.
  7. 7.Round 98291 to the nearest hundred.
  8. 8.Which is closest to 199 + 601 + 200? (a) 900 (b) 1200 (c) 1100 (d) 1000
  9. 9.Round 59846 to the nearest ten.
  10. 10.Which is closest to 405 ÷ 21? (a) 20 (b) 10 (c) 40 (d) 200
  11. 11.Which is closest to 1591 ÷ 41? (a) 400 (b) 20 (c) 80 (d) 40
  12. 12.Which is closest to 105 + 903 + 597? (a) 1800 (b) 1700 (c) 1500 (d) 1600
  13. 13.Which is closest to 503 × 20? (Round each number first.) (a) 100000 (b) 20000 (c) 10000 (d) 1000
  14. 14.Which is closest to 1792 ÷ 31? (a) 30 (b) 600 (c) 120 (d) 60
  15. 15.Which is closest to 797 + 798 + 297? (a) 1900 (b) 2100 (c) 2000 (d) 1800
  16. 16.Which is closest to 97 + 97 + 598? (a) 900 (b) 700 (c) 800 (d) 1000
  17. 17.Which is closest to 1001 ÷ 49? (a) 10 (b) 20 (c) 200 (d) 40
  18. 18.Which is closest to 598 × 41? (Round each number first.) (a) 2400 (b) 240000 (c) 48000 (d) 24000
  19. 19.Which is closest to 296 + 703 + 297? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  20. 20.Which is closest to 791 ÷ 39? (a) 10 (b) 200 (c) 40 (d) 20
  21. 21.Which is closest to 2398 ÷ 39? (a) 120 (b) 600 (c) 30 (d) 60
  22. 22.Which is closest to 498 + 502 + 796? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  23. 23.Round 15.89 to one decimal place. =
  24. 24.Which is closest to 596 + 501 + 96? (a) 1100 (b) 1200 (c) 1300 (d) 1400
  25. 25.Which is closest to 800 + 895 + 198? (a) 1800 (b) 2100 (c) 2000 (d) 1900
  26. 26.Which is closest to 2108 ÷ 29? (a) 70 (b) 700 (c) 35 (d) 140
  27. 27.Which is closest to 902 × 50? (Round each number first.) (a) 90000 (b) 45000 (c) 450000 (d) 4500
  28. 28.Which is closest to 999 ÷ 19? (a) 100 (b) 500 (c) 25 (d) 50
  29. 29.Round 75070 to the nearest hundred.
  30. 30.Which is closest to 2391 ÷ 29? (a) 160 (b) 80 (c) 40 (d) 800
  31. 31.Which is closest to 304 × 19? (Round each number first.) (a) 60000 (b) 12000 (c) 600 (d) 6000
  32. 32.Which is closest to 603 × 28? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
  33. 33.Which is closest to 95 + 395 + 98? (a) 800 (b) 500 (c) 700 (d) 600
  34. 34.Round 31904 to the nearest ten.
  35. 35.Which is closest to 598 × 68? (Round each number first.) (a) 4200 (b) 420000 (c) 42000 (d) 84000
  36. 36.Round 29.36 to one decimal place. =
  37. 37.Which is closest to 402 × 28? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  38. 38.Round 14.88 to one decimal place. =
  39. 39.Which is closest to 703 + 404 + 896? (a) 2100 (b) 2200 (c) 1900 (d) 2000
  40. 40.Which is closest to 403 × 41? (Round each number first.) (a) 32000 (b) 160000 (c) 1600 (d) 16000

Answer key

  1. 2400
  2. 6000
  3. 1300
  4. 50.2
  5. 700
  6. 17000
  7. 98300
  8. 1000
  9. 59850
  10. 20
  11. 40
  12. 1600
  13. 10000
  14. 60
  15. 1900
  16. 800
  17. 20
  18. 24000
  19. 1300
  20. 20
  21. 60
  22. 1800
  23. 15.9
  24. 1200
  25. 1900
  26. 70
  27. 45000
  28. 50
  29. 75100
  30. 80
  31. 6000
  32. 18000
  33. 600
  34. 31900
  35. 42000
  36. 29.4
  37. 12000
  38. 14.9
  39. 2000
  40. 16000

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