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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 43 · 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 703 × 40? (Round each number first.) (a) 280000 (b) 2800 (c) 28000 (d) 56000
  2. 2.Which is closest to 2707 ÷ 29? (a) 180 (b) 45 (c) 90 (d) 900
  3. 3.Which is closest to 396 × 90? (Round each number first.) (a) 72000 (b) 360000 (c) 3600 (d) 36000
  4. 4.Which is closest to 805 + 196 + 297? (a) 1300 (b) 1500 (c) 1400 (d) 1200
  5. 5.Which is closest to 902 × 68? (Round each number first.) (a) 126000 (b) 630000 (c) 6300 (d) 63000
  6. 6.Which is closest to 196 × 58? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000
  7. 7.Which is closest to 102 + 497 + 797? (a) 1500 (b) 1400 (c) 1300 (d) 1600
  8. 8.Which is closest to 1495 ÷ 31? (a) 100 (b) 25 (c) 50 (d) 500
  9. 9.Which is closest to 3991 ÷ 49? (a) 80 (b) 40 (c) 800 (d) 160
  10. 10.Round 68.18 to one decimal place. =
  11. 11.Round 23326 to the nearest hundred.
  12. 12.Which is closest to 2994 ÷ 51? (a) 30 (b) 600 (c) 60 (d) 120
  13. 13.Round 11.44 to one decimal place. =
  14. 14.Which is closest to 402 × 61? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  15. 15.Round 46.26 to one decimal place. =
  16. 16.Round 81.62 to one decimal place. =
  17. 17.Which is closest to 502 + 802 + 700? (a) 1900 (b) 2000 (c) 2100 (d) 2200
  18. 18.Round 88318 to the nearest hundred.
  19. 19.Round 31661 to the nearest hundred.
  20. 20.Round 61.68 to one decimal place. =
  21. 21.Which is closest to 697 + 699 + 801? (a) 2400 (b) 2100 (c) 2200 (d) 2300
  22. 22.Which is closest to 495 + 601 + 896? (a) 2000 (b) 2100 (c) 2200 (d) 1900
  23. 23.Which is closest to 2406 ÷ 29? (a) 160 (b) 80 (c) 40 (d) 800
  24. 24.Which is closest to 499 + 396 + 205? (a) 1300 (b) 1200 (c) 1100 (d) 1000
  25. 25.Which is closest to 403 × 32? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  26. 26.Round 91343 to the nearest thousand.
  27. 27.Which is closest to 1195 ÷ 39? (a) 15 (b) 60 (c) 30 (d) 300
  28. 28.Which is closest to 301 + 902 + 603? (a) 1900 (b) 1800 (c) 1700 (d) 2000
  29. 29.Which is closest to 2393 ÷ 31? (a) 800 (b) 80 (c) 160 (d) 40
  30. 30.Which is closest to 204 + 695 + 497? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  31. 31.Which is closest to 296 × 50? (Round each number first.) (a) 15000 (b) 150000 (c) 1500 (d) 30000
  32. 32.Which is closest to 699 × 19? (Round each number first.) (a) 14000 (b) 28000 (c) 1400 (d) 140000
  33. 33.Round 37878 to the nearest hundred.
  34. 34.Which is closest to 299 + 697 + 605? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  35. 35.Round 90.17 to one decimal place. =
  36. 36.Which is closest to 598 × 29? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  37. 37.Which is closest to 698 × 72? (Round each number first.) (a) 490000 (b) 98000 (c) 4900 (d) 49000
  38. 38.Which is closest to 3508 ÷ 49? (a) 35 (b) 70 (c) 140 (d) 700
  39. 39.Round 73343 to the nearest hundred.
  40. 40.Round 51627 to the nearest ten.

Answer key

  1. 28000
  2. 90
  3. 36000
  4. 1300
  5. 63000
  6. 12000
  7. 1400
  8. 50
  9. 80
  10. 68.2
  11. 23300
  12. 60
  13. 11.4
  14. 24000
  15. 46.3
  16. 81.6
  17. 2000
  18. 88300
  19. 31700
  20. 61.7
  21. 2200
  22. 2000
  23. 80
  24. 1100
  25. 12000
  26. 91000
  27. 30
  28. 1800
  29. 80
  30. 1400
  31. 15000
  32. 14000
  33. 37900
  34. 1600
  35. 90.2
  36. 18000
  37. 49000
  38. 70
  39. 73300
  40. 51630

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