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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 144 · 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 201 + 302 + 800? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  2. 2.Round 26215 to the nearest hundred.
  3. 3.Which is closest to 197 × 39? (Round each number first.) (a) 16000 (b) 80000 (c) 800 (d) 8000
  4. 4.Which is closest to 497 × 30? (Round each number first.) (a) 30000 (b) 1500 (c) 15000 (d) 150000
  5. 5.Which is closest to 204 + 699 + 902? (a) 2000 (b) 1900 (c) 1800 (d) 1700
  6. 6.Which is closest to 900 × 19? (Round each number first.) (a) 1800 (b) 36000 (c) 18000 (d) 180000
  7. 7.Round 23724 to the nearest hundred.
  8. 8.Which is closest to 2795 ÷ 39? (a) 70 (b) 700 (c) 140 (d) 35
  9. 9.Round 20546 to the nearest ten.
  10. 10.Round 13.57 to one decimal place. =
  11. 11.Round 76.91 to one decimal place. =
  12. 12.Which is closest to 798 × 28? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000
  13. 13.Which is closest to 298 × 21? (Round each number first.) (a) 600 (b) 60000 (c) 12000 (d) 6000
  14. 14.Which is closest to 903 × 71? (Round each number first.) (a) 630000 (b) 126000 (c) 6300 (d) 63000
  15. 15.Which is closest to 806 ÷ 21? (a) 20 (b) 80 (c) 400 (d) 40
  16. 16.Round 43951 to the nearest hundred.
  17. 17.Which is closest to 703 × 52? (Round each number first.) (a) 350000 (b) 70000 (c) 3500 (d) 35000
  18. 18.Which is closest to 300 + 498 + 302? (a) 1200 (b) 1000 (c) 1300 (d) 1100
  19. 19.Round 15105 to the nearest thousand.
  20. 20.Round 19103 to the nearest ten.
  21. 21.Round 38.71 to one decimal place. =
  22. 22.Which is closest to 905 + 300 + 800? (a) 1900 (b) 2000 (c) 2100 (d) 2200
  23. 23.Round 10946 to the nearest ten.
  24. 24.Which is closest to 496 × 61? (Round each number first.) (a) 300000 (b) 3000 (c) 60000 (d) 30000
  25. 25.Which is closest to 401 × 22? (Round each number first.) (a) 80000 (b) 8000 (c) 16000 (d) 800
  26. 26.Which is closest to 697 + 802 + 397? (a) 2000 (b) 2100 (c) 1900 (d) 1800
  27. 27.Round 15299 to the nearest hundred.
  28. 28.Round 75.37 to one decimal place. =
  29. 29.Which is closest to 403 + 504 + 502? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  30. 30.Which is closest to 3494 ÷ 51? (a) 700 (b) 35 (c) 140 (d) 70
  31. 31.Which is closest to 898 × 68? (Round each number first.) (a) 6300 (b) 63000 (c) 630000 (d) 126000
  32. 32.Which is closest to 800 + 295 + 296? (a) 1500 (b) 1300 (c) 1600 (d) 1400
  33. 33.Which is closest to 798 × 30? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  34. 34.Round 17.34 to one decimal place. =
  35. 35.Which is closest to 98 + 602 + 197? (a) 1000 (b) 800 (c) 900 (d) 1100
  36. 36.Which is closest to 1502 ÷ 31? (a) 500 (b) 25 (c) 50 (d) 100
  37. 37.Which is closest to 1201 ÷ 29? (a) 80 (b) 20 (c) 400 (d) 40
  38. 38.Round 83.16 to one decimal place. =
  39. 39.Which is closest to 798 + 604 + 595? (a) 2000 (b) 2200 (c) 2100 (d) 1900
  40. 40.Which is closest to 600 + 297 + 299? (a) 1100 (b) 1400 (c) 1300 (d) 1200

Answer key

  1. 1300
  2. 26200
  3. 8000
  4. 15000
  5. 1800
  6. 18000
  7. 23700
  8. 70
  9. 20550
  10. 13.6
  11. 76.9
  12. 24000
  13. 6000
  14. 63000
  15. 40
  16. 44000
  17. 35000
  18. 1100
  19. 15000
  20. 19100
  21. 38.7
  22. 2000
  23. 10950
  24. 30000
  25. 8000
  26. 1900
  27. 15300
  28. 75.4
  29. 1400
  30. 70
  31. 63000
  32. 1400
  33. 24000
  34. 17.3
  35. 900
  36. 50
  37. 40
  38. 83.2
  39. 2000
  40. 1200

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