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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 484 · 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 696 × 58? (Round each number first.) (a) 42000 (b) 84000 (c) 420000 (d) 4200
  2. 2.Which is closest to 2799 ÷ 41? (a) 140 (b) 35 (c) 700 (d) 70
  3. 3.Which is closest to 601 + 102 + 599? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  4. 4.Which is closest to 894 ÷ 29? (a) 60 (b) 30 (c) 300 (d) 15
  5. 5.Which is closest to 402 + 903 + 701? (a) 2200 (b) 1900 (c) 2000 (d) 2100
  6. 6.Which is closest to 993 ÷ 51? (a) 40 (b) 20 (c) 200 (d) 10
  7. 7.Which is closest to 199 × 21? (Round each number first.) (a) 8000 (b) 400 (c) 4000 (d) 40000
  8. 8.Which is closest to 4499 ÷ 51? (a) 45 (b) 900 (c) 90 (d) 180
  9. 9.Which is closest to 698 × 51? (Round each number first.) (a) 3500 (b) 70000 (c) 35000 (d) 350000
  10. 10.Which is closest to 396 × 31? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  11. 11.Round 40394 to the nearest ten.
  12. 12.Which is closest to 1194 ÷ 41? (a) 30 (b) 15 (c) 60 (d) 300
  13. 13.Which is closest to 595 + 595 + 801? (a) 2100 (b) 1900 (c) 2200 (d) 2000
  14. 14.Round 63009 to the nearest thousand.
  15. 15.Which is closest to 303 + 196 + 400? (a) 1000 (b) 800 (c) 900 (d) 1100
  16. 16.Which is closest to 198 × 82? (Round each number first.) (a) 16000 (b) 32000 (c) 160000 (d) 1600
  17. 17.Which is closest to 897 + 796 + 704? (a) 2500 (b) 2600 (c) 2400 (d) 2300
  18. 18.Which is closest to 2401 ÷ 31? (a) 800 (b) 160 (c) 80 (d) 40
  19. 19.Round 26.84 to one decimal place. =
  20. 20.Which is closest to 398 × 62? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  21. 21.Which is closest to 901 × 39? (Round each number first.) (a) 36000 (b) 3600 (c) 360000 (d) 72000
  22. 22.Which is closest to 1508 ÷ 49? (a) 30 (b) 60 (c) 300 (d) 15
  23. 23.Which is closest to 402 + 96 + 796? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  24. 24.Which is closest to 601 ÷ 21? (a) 300 (b) 60 (c) 30 (d) 15
  25. 25.Which is closest to 403 × 49? (Round each number first.) (a) 40000 (b) 200000 (c) 20000 (d) 2000
  26. 26.Round 20.28 to one decimal place. =
  27. 27.Round 81.11 to one decimal place. =
  28. 28.Which is closest to 1202 ÷ 31? (a) 400 (b) 20 (c) 40 (d) 80
  29. 29.Which is closest to 498 + 701 + 200? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  30. 30.Which is closest to 205 + 405 + 803? (a) 1400 (b) 1600 (c) 1500 (d) 1300
  31. 31.Round 16.32 to one decimal place. =
  32. 32.Round 76064 to the nearest hundred.
  33. 33.Which is closest to 598 × 18? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  34. 34.Which is closest to 593 ÷ 19? (a) 15 (b) 30 (c) 60 (d) 300
  35. 35.Which is closest to 698 × 50? (Round each number first.) (a) 35000 (b) 3500 (c) 350000 (d) 70000
  36. 36.Round 10893 to the nearest ten.
  37. 37.Which is closest to 2097 ÷ 31? (a) 35 (b) 140 (c) 70 (d) 700
  38. 38.Round 66.76 to one decimal place. =
  39. 39.Which is closest to 598 + 402 + 299? (a) 1400 (b) 1200 (c) 1300 (d) 1500
  40. 40.Round 87729 to the nearest thousand.

Answer key

  1. 42000
  2. 70
  3. 1300
  4. 30
  5. 2000
  6. 20
  7. 4000
  8. 90
  9. 35000
  10. 12000
  11. 40390
  12. 30
  13. 2000
  14. 63000
  15. 900
  16. 16000
  17. 2400
  18. 80
  19. 26.8
  20. 24000
  21. 36000
  22. 30
  23. 1300
  24. 30
  25. 20000
  26. 20.3
  27. 81.1
  28. 40
  29. 1400
  30. 1400
  31. 16.3
  32. 76100
  33. 12000
  34. 30
  35. 35000
  36. 10890
  37. 70
  38. 66.8
  39. 1300
  40. 88000

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