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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 387 · 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 805 + 703 + 601? (a) 2300 (b) 2000 (c) 2100 (d) 2200
  2. 2.Which is closest to 702 × 62? (Round each number first.) (a) 420000 (b) 84000 (c) 42000 (d) 4200
  3. 3.Round 99065 to the nearest hundred.
  4. 4.Which is closest to 796 × 59? (Round each number first.) (a) 48000 (b) 96000 (c) 480000 (d) 4800
  5. 5.Round 52.82 to one decimal place. =
  6. 6.Which is closest to 2504 ÷ 51? (a) 50 (b) 500 (c) 25 (d) 100
  7. 7.Which is closest to 402 + 703 + 96? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  8. 8.Round 34494 to the nearest ten.
  9. 9.Round 39898 to the nearest hundred.
  10. 10.Round 88.33 to one decimal place. =
  11. 11.Which is closest to 900 + 404 + 198? (a) 1400 (b) 1600 (c) 1500 (d) 1700
  12. 12.Which is closest to 3204 ÷ 39? (a) 40 (b) 160 (c) 80 (d) 800
  13. 13.Which is closest to 296 × 82? (Round each number first.) (a) 24000 (b) 240000 (c) 48000 (d) 2400
  14. 14.Which is closest to 401 + 95 + 301? (a) 700 (b) 1000 (c) 900 (d) 800
  15. 15.Which is closest to 698 + 398 + 898? (a) 2100 (b) 2200 (c) 1900 (d) 2000
  16. 16.Which is closest to 405 + 799 + 298? (a) 1500 (b) 1400 (c) 1600 (d) 1700
  17. 17.Round 96.83 to one decimal place. =
  18. 18.Which is closest to 602 × 29? (Round each number first.) (a) 1800 (b) 36000 (c) 18000 (d) 180000
  19. 19.Round 11411 to the nearest ten.
  20. 20.Round 18967 to the nearest hundred.
  21. 21.Round 47.73 to one decimal place. =
  22. 22.Which is closest to 796 × 60? (Round each number first.) (a) 48000 (b) 4800 (c) 96000 (d) 480000
  23. 23.Which is closest to 391 ÷ 19? (a) 40 (b) 10 (c) 20 (d) 200
  24. 24.Which is closest to 398 × 59? (Round each number first.) (a) 24000 (b) 240000 (c) 2400 (d) 48000
  25. 25.Which is closest to 997 ÷ 49? (a) 10 (b) 200 (c) 20 (d) 40
  26. 26.Round 51659 to the nearest ten.
  27. 27.Which is closest to 1600 ÷ 19? (a) 800 (b) 40 (c) 160 (d) 80
  28. 28.Which is closest to 901 × 58? (Round each number first.) (a) 540000 (b) 108000 (c) 5400 (d) 54000
  29. 29.Which is closest to 299 + 897 + 600? (a) 1800 (b) 2000 (c) 1700 (d) 1900
  30. 30.Which is closest to 2100 ÷ 29? (a) 140 (b) 700 (c) 35 (d) 70
  31. 31.Round 40739 to the nearest ten.
  32. 32.Which is closest to 603 × 89? (Round each number first.) (a) 108000 (b) 54000 (c) 5400 (d) 540000
  33. 33.Round 23.19 to one decimal place. =
  34. 34.Round 28710 to the nearest thousand.
  35. 35.Round 48.89 to one decimal place. =
  36. 36.Which is closest to 397 × 31? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  37. 37.Round 60012 to the nearest thousand.
  38. 38.Round 85816 to the nearest thousand.
  39. 39.Which is closest to 4009 ÷ 51? (a) 800 (b) 160 (c) 80 (d) 40
  40. 40.Which is closest to 402 + 705 + 600? (a) 1800 (b) 1600 (c) 1700 (d) 1900

Answer key

  1. 2100
  2. 42000
  3. 99100
  4. 48000
  5. 52.8
  6. 50
  7. 1200
  8. 34490
  9. 39900
  10. 88.3
  11. 1500
  12. 80
  13. 24000
  14. 800
  15. 2000
  16. 1500
  17. 96.8
  18. 18000
  19. 11410
  20. 19000
  21. 47.7
  22. 48000
  23. 20
  24. 24000
  25. 20
  26. 51660
  27. 80
  28. 54000
  29. 1800
  30. 70
  31. 40740
  32. 54000
  33. 23.2
  34. 29000
  35. 48.9
  36. 12000
  37. 60000
  38. 86000
  39. 80
  40. 1700

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