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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 751 · 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 89555 to the nearest hundred.
  2. 2.Round 63344 to the nearest hundred.
  3. 3.Which is closest to 495 + 600 + 502? (a) 1600 (b) 1700 (c) 1500 (d) 1800
  4. 4.Round 83.24 to one decimal place. =
  5. 5.Round 15710 to the nearest thousand.
  6. 6.Round 28.18 to one decimal place. =
  7. 7.Which is closest to 402 × 41? (Round each number first.) (a) 16000 (b) 160000 (c) 1600 (d) 32000
  8. 8.Which is closest to 2004 ÷ 51? (a) 80 (b) 20 (c) 400 (d) 40
  9. 9.Round 79521 to the nearest ten.
  10. 10.Round 25.28 to one decimal place. =
  11. 11.Which is closest to 899 × 59? (Round each number first.) (a) 5400 (b) 540000 (c) 108000 (d) 54000
  12. 12.Which is closest to 203 × 92? (Round each number first.) (a) 1800 (b) 18000 (c) 36000 (d) 180000
  13. 13.Which is closest to 503 × 48? (Round each number first.) (a) 50000 (b) 2500 (c) 25000 (d) 250000
  14. 14.Round 41.38 to one decimal place. =
  15. 15.Round 76183 to the nearest ten.
  16. 16.Which is closest to 203 + 902 + 501? (a) 1500 (b) 1600 (c) 1700 (d) 1800
  17. 17.Which is closest to 498 × 29? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
  18. 18.Which is closest to 302 × 61? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  19. 19.Which is closest to 1193 ÷ 29? (a) 80 (b) 400 (c) 40 (d) 20
  20. 20.Which is closest to 2403 ÷ 39? (a) 60 (b) 600 (c) 30 (d) 120
  21. 21.Which is closest to 599 × 29? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  22. 22.Which is closest to 4505 ÷ 51? (a) 900 (b) 45 (c) 180 (d) 90
  23. 23.Round 37.42 to one decimal place. =
  24. 24.Which is closest to 297 + 495 + 803? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  25. 25.Which is closest to 696 × 62? (Round each number first.) (a) 4200 (b) 84000 (c) 42000 (d) 420000
  26. 26.Round 79.82 to one decimal place. =
  27. 27.Which is closest to 300 + 903 + 599? (a) 1800 (b) 1900 (c) 2000 (d) 1700
  28. 28.Which is closest to 1207 ÷ 19? (a) 600 (b) 30 (c) 120 (d) 60
  29. 29.Which is closest to 303 × 38? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  30. 30.Round 67895 to the nearest hundred.
  31. 31.Which is closest to 2693 ÷ 29? (a) 45 (b) 180 (c) 90 (d) 900
  32. 32.Which is closest to 4504 ÷ 51? (a) 180 (b) 45 (c) 900 (d) 90
  33. 33.Which is closest to 2095 ÷ 31? (a) 70 (b) 700 (c) 140 (d) 35
  34. 34.Which is closest to 401 + 597 + 205? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  35. 35.Which is closest to 197 + 699 + 698? (a) 1800 (b) 1600 (c) 1700 (d) 1500
  36. 36.Which is closest to 698 × 91? (Round each number first.) (a) 630000 (b) 6300 (c) 126000 (d) 63000
  37. 37.Which is closest to 199 + 300 + 302? (a) 700 (b) 900 (c) 800 (d) 1000
  38. 38.Round 61315 to the nearest hundred.
  39. 39.Round 47815 to the nearest thousand.
  40. 40.Round 16.93 to one decimal place. =

Answer key

  1. 89600
  2. 63300
  3. 1600
  4. 83.2
  5. 16000
  6. 28.2
  7. 16000
  8. 40
  9. 79520
  10. 25.3
  11. 54000
  12. 18000
  13. 25000
  14. 41.4
  15. 76180
  16. 1600
  17. 15000
  18. 18000
  19. 40
  20. 60
  21. 18000
  22. 90
  23. 37.4
  24. 1600
  25. 42000
  26. 79.8
  27. 1800
  28. 60
  29. 12000
  30. 67900
  31. 90
  32. 90
  33. 70
  34. 1200
  35. 1600
  36. 63000
  37. 800
  38. 61300
  39. 48000
  40. 16.9

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