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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 123 · 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.Round 81.61 to one decimal place. =
  2. 2.Which is closest to 1503 ÷ 31? (a) 25 (b) 500 (c) 50 (d) 100
  3. 3.Round 60.74 to one decimal place. =
  4. 4.Round 49224 to the nearest ten.
  5. 5.Which is closest to 400 × 39? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
  6. 6.Round 52.46 to one decimal place. =
  7. 7.Which is closest to 2095 ÷ 31? (a) 700 (b) 70 (c) 35 (d) 140
  8. 8.Which is closest to 198 × 62? (Round each number first.) (a) 12000 (b) 24000 (c) 1200 (d) 120000
  9. 9.Which is closest to 99 + 95 + 198? (a) 600 (b) 300 (c) 500 (d) 400
  10. 10.Which is closest to 800 + 798 + 700? (a) 2400 (b) 2500 (c) 2200 (d) 2300
  11. 11.Which is closest to 298 × 18? (Round each number first.) (a) 6000 (b) 60000 (c) 600 (d) 12000
  12. 12.Which is closest to 202 + 605 + 399? (a) 1400 (b) 1100 (c) 1300 (d) 1200
  13. 13.Which is closest to 696 + 500 + 303? (a) 1500 (b) 1600 (c) 1400 (d) 1700
  14. 14.Which is closest to 696 × 69? (Round each number first.) (a) 490000 (b) 4900 (c) 98000 (d) 49000
  15. 15.Which is closest to 2397 ÷ 29? (a) 40 (b) 80 (c) 800 (d) 160
  16. 16.Which is closest to 2107 ÷ 31? (a) 140 (b) 700 (c) 70 (d) 35
  17. 17.Which is closest to 195 + 896 + 199? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  18. 18.Which is closest to 300 + 802 + 701? (a) 1700 (b) 1900 (c) 1800 (d) 2000
  19. 19.Round 30188 to the nearest ten.
  20. 20.Round 46.46 to one decimal place. =
  21. 21.Round 61556 to the nearest ten.
  22. 22.Round 99.47 to one decimal place. =
  23. 23.Which is closest to 798 × 68? (Round each number first.) (a) 112000 (b) 560000 (c) 56000 (d) 5600
  24. 24.Round 23.84 to one decimal place. =
  25. 25.Which is closest to 602 × 18? (Round each number first.) (a) 120000 (b) 1200 (c) 12000 (d) 24000
  26. 26.Which is closest to 396 × 18? (Round each number first.) (a) 800 (b) 8000 (c) 16000 (d) 80000
  27. 27.Round 27.44 to one decimal place. =
  28. 28.Which is closest to 798 × 21? (Round each number first.) (a) 1600 (b) 160000 (c) 16000 (d) 32000
  29. 29.Which is closest to 696 × 48? (Round each number first.) (a) 70000 (b) 3500 (c) 35000 (d) 350000
  30. 30.Which is closest to 897 × 52? (Round each number first.) (a) 450000 (b) 90000 (c) 45000 (d) 4500
  31. 31.Which is closest to 699 + 398 + 700? (a) 1700 (b) 1800 (c) 1900 (d) 2000
  32. 32.Which is closest to 2705 ÷ 31? (a) 180 (b) 900 (c) 45 (d) 90
  33. 33.Which is closest to 1493 ÷ 49? (a) 30 (b) 300 (c) 60 (d) 15
  34. 34.Which is closest to 903 × 69? (Round each number first.) (a) 630000 (b) 6300 (c) 63000 (d) 126000
  35. 35.Round 19.48 to one decimal place. =
  36. 36.Which is closest to 403 × 31? (Round each number first.) (a) 12000 (b) 120000 (c) 24000 (d) 1200
  37. 37.Which is closest to 1395 ÷ 21? (a) 35 (b) 700 (c) 140 (d) 70
  38. 38.Which is closest to 1405 ÷ 19? (a) 700 (b) 70 (c) 35 (d) 140
  39. 39.Which is closest to 594 ÷ 21? (a) 30 (b) 60 (c) 300 (d) 15
  40. 40.Round 6700 to the nearest thousand.

Answer key

  1. 81.6
  2. 50
  3. 60.7
  4. 49220
  5. 16000
  6. 52.5
  7. 70
  8. 12000
  9. 400
  10. 2300
  11. 6000
  12. 1200
  13. 1500
  14. 49000
  15. 80
  16. 70
  17. 1300
  18. 1800
  19. 30190
  20. 46.5
  21. 61560
  22. 99.5
  23. 56000
  24. 23.8
  25. 12000
  26. 8000
  27. 27.4
  28. 16000
  29. 35000
  30. 45000
  31. 1800
  32. 90
  33. 30
  34. 63000
  35. 19.5
  36. 12000
  37. 70
  38. 70
  39. 30
  40. 7000

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