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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 97 · 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 605 + 405 + 104? (a) 1300 (b) 1100 (c) 1000 (d) 1200
  2. 2.Round 61950 to the nearest thousand.
  3. 3.Which is closest to 502 × 59? (Round each number first.) (a) 300000 (b) 3000 (c) 30000 (d) 60000
  4. 4.Round 58997 to the nearest thousand.
  5. 5.Which is closest to 798 × 38? (Round each number first.) (a) 3200 (b) 32000 (c) 64000 (d) 320000
  6. 6.Which is closest to 403 × 28? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  7. 7.Which is closest to 2708 ÷ 31? (a) 900 (b) 90 (c) 180 (d) 45
  8. 8.Round 63.87 to one decimal place. =
  9. 9.Round 46660 to the nearest hundred.
  10. 10.Round 75.64 to one decimal place. =
  11. 11.Which is closest to 1494 ÷ 31? (a) 500 (b) 100 (c) 50 (d) 25
  12. 12.Which is closest to 807 ÷ 21? (a) 400 (b) 40 (c) 80 (d) 20
  13. 13.Round 58.89 to one decimal place. =
  14. 14.Round 86102 to the nearest hundred.
  15. 15.Which is closest to 696 × 79? (Round each number first.) (a) 56000 (b) 560000 (c) 5600 (d) 112000
  16. 16.Which is closest to 100 + 96 + 603? (a) 900 (b) 1000 (c) 700 (d) 800
  17. 17.Which is closest to 697 × 28? (Round each number first.) (a) 210000 (b) 21000 (c) 2100 (d) 42000
  18. 18.Which is closest to 897 + 405 + 598? (a) 1800 (b) 1900 (c) 2100 (d) 2000
  19. 19.Which is closest to 901 × 60? (Round each number first.) (a) 5400 (b) 54000 (c) 108000 (d) 540000
  20. 20.Which is closest to 696 + 98 + 98? (a) 800 (b) 1100 (c) 1000 (d) 900
  21. 21.Which is closest to 2504 ÷ 49? (a) 50 (b) 25 (c) 500 (d) 100
  22. 22.Which is closest to 395 + 95 + 302? (a) 1000 (b) 700 (c) 800 (d) 900
  23. 23.Which is closest to 408 ÷ 19? (a) 20 (b) 40 (c) 10 (d) 200
  24. 24.Round 90.23 to one decimal place. =
  25. 25.Round 52131 to the nearest ten.
  26. 26.Which is closest to 2501 ÷ 49? (a) 100 (b) 50 (c) 500 (d) 25
  27. 27.Which is closest to 1806 ÷ 21? (a) 900 (b) 180 (c) 45 (d) 90
  28. 28.Which is closest to 796 ÷ 41? (a) 10 (b) 20 (c) 40 (d) 200
  29. 29.Round 47906 to the nearest thousand.
  30. 30.Which is closest to 897 + 699 + 405? (a) 2000 (b) 1900 (c) 2100 (d) 2200
  31. 31.Round 74.18 to one decimal place. =
  32. 32.Which is closest to 503 × 91? (Round each number first.) (a) 450000 (b) 90000 (c) 4500 (d) 45000
  33. 33.Round 86041 to the nearest ten.
  34. 34.Round 37.88 to one decimal place. =
  35. 35.Which is closest to 99 + 895 + 896? (a) 2100 (b) 1800 (c) 1900 (d) 2000
  36. 36.Which is closest to 401 × 28? (Round each number first.) (a) 24000 (b) 1200 (c) 120000 (d) 12000
  37. 37.Which is closest to 400 × 78? (Round each number first.) (a) 320000 (b) 64000 (c) 32000 (d) 3200
  38. 38.Which is closest to 798 + 699 + 204? (a) 1800 (b) 1900 (c) 1700 (d) 1600
  39. 39.Which is closest to 302 × 79? (Round each number first.) (a) 24000 (b) 2400 (c) 48000 (d) 240000
  40. 40.Which is closest to 2701 ÷ 31? (a) 900 (b) 45 (c) 180 (d) 90

Answer key

  1. 1100
  2. 62000
  3. 30000
  4. 59000
  5. 32000
  6. 12000
  7. 90
  8. 63.9
  9. 46700
  10. 75.6
  11. 50
  12. 40
  13. 58.9
  14. 86100
  15. 56000
  16. 800
  17. 21000
  18. 1900
  19. 54000
  20. 900
  21. 50
  22. 800
  23. 20
  24. 90.2
  25. 52130
  26. 50
  27. 90
  28. 20
  29. 48000
  30. 2000
  31. 74.2
  32. 45000
  33. 86040
  34. 37.9
  35. 1900
  36. 12000
  37. 32000
  38. 1700
  39. 24000
  40. 90

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