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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 65 · 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 809 ÷ 39? (a) 200 (b) 40 (c) 10 (d) 20
  2. 2.Which is closest to 601 + 805 + 195? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  3. 3.Round 90770 to the nearest thousand.
  4. 4.Which is closest to 203 + 200 + 404? (a) 700 (b) 1000 (c) 800 (d) 900
  5. 5.Round 22.59 to one decimal place. =
  6. 6.Which is closest to 1507 ÷ 51? (a) 60 (b) 300 (c) 15 (d) 30
  7. 7.Round 33446 to the nearest hundred.
  8. 8.Round 73.58 to one decimal place. =
  9. 9.Which is closest to 597 × 78? (Round each number first.) (a) 96000 (b) 48000 (c) 480000 (d) 4800
  10. 10.Which is closest to 405 ÷ 19? (a) 200 (b) 40 (c) 10 (d) 20
  11. 11.Which is closest to 500 + 101 + 705? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  12. 12.Which is closest to 305 + 698 + 400? (a) 1400 (b) 1300 (c) 1500 (d) 1600
  13. 13.Which is closest to 3599 ÷ 41? (a) 180 (b) 45 (c) 900 (d) 90
  14. 14.Which is closest to 898 × 90? (Round each number first.) (a) 81000 (b) 162000 (c) 8100 (d) 810000
  15. 15.Which is closest to 796 ÷ 41? (a) 40 (b) 20 (c) 10 (d) 200
  16. 16.Which is closest to 603 × 91? (Round each number first.) (a) 108000 (b) 5400 (c) 54000 (d) 540000
  17. 17.Which is closest to 195 + 305 + 304? (a) 900 (b) 800 (c) 1000 (d) 700
  18. 18.Round 36493 to the nearest thousand.
  19. 19.Round 40.09 to one decimal place. =
  20. 20.Which is closest to 1808 ÷ 19? (a) 45 (b) 900 (c) 180 (d) 90
  21. 21.Round 45.64 to one decimal place. =
  22. 22.Which is closest to 705 + 497 + 595? (a) 2000 (b) 1800 (c) 1700 (d) 1900
  23. 23.Which is closest to 700 × 18? (Round each number first.) (a) 1400 (b) 140000 (c) 14000 (d) 28000
  24. 24.Round 30501 to the nearest thousand.
  25. 25.Which is closest to 397 ÷ 21? (a) 40 (b) 200 (c) 20 (d) 10
  26. 26.Which is closest to 1206 ÷ 29? (a) 20 (b) 80 (c) 40 (d) 400
  27. 27.Round 91.93 to one decimal place. =
  28. 28.Round 24082 to the nearest hundred.
  29. 29.Which is closest to 304 + 97 + 98? (a) 700 (b) 400 (c) 500 (d) 600
  30. 30.Which is closest to 601 × 71? (Round each number first.) (a) 4200 (b) 42000 (c) 84000 (d) 420000
  31. 31.Round 42.53 to one decimal place. =
  32. 32.Which is closest to 992 ÷ 21? (a) 50 (b) 500 (c) 25 (d) 100
  33. 33.Which is closest to 604 × 70? (Round each number first.) (a) 4200 (b) 420000 (c) 84000 (d) 42000
  34. 34.Round 89.51 to one decimal place. =
  35. 35.Which is closest to 502 × 90? (Round each number first.) (a) 4500 (b) 45000 (c) 450000 (d) 90000
  36. 36.Round 85670 to the nearest hundred.
  37. 37.Round 83135 to the nearest hundred.
  38. 38.Which is closest to 802 × 78? (Round each number first.) (a) 6400 (b) 128000 (c) 640000 (d) 64000
  39. 39.Which is closest to 798 + 303 + 397? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  40. 40.Round 37.72 to one decimal place. =

Answer key

  1. 20
  2. 1600
  3. 91000
  4. 800
  5. 22.6
  6. 30
  7. 33400
  8. 73.6
  9. 48000
  10. 20
  11. 1300
  12. 1400
  13. 90
  14. 81000
  15. 20
  16. 54000
  17. 800
  18. 36000
  19. 40.1
  20. 90
  21. 45.6
  22. 1800
  23. 14000
  24. 31000
  25. 20
  26. 40
  27. 91.9
  28. 24100
  29. 500
  30. 42000
  31. 42.5
  32. 50
  33. 42000
  34. 89.5
  35. 45000
  36. 85700
  37. 83100
  38. 64000
  39. 1500
  40. 37.7

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