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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 634 · 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 2007 ÷ 39? (a) 25 (b) 100 (c) 50 (d) 500
  2. 2.Which is closest to 804 × 70? (Round each number first.) (a) 5600 (b) 56000 (c) 560000 (d) 112000
  3. 3.Which is closest to 1797 ÷ 29? (a) 60 (b) 600 (c) 120 (d) 30
  4. 4.Which is closest to 198 × 58? (Round each number first.) (a) 1200 (b) 12000 (c) 120000 (d) 24000
  5. 5.Round 91247 to the nearest thousand.
  6. 6.Which is closest to 198 × 31? (Round each number first.) (a) 600 (b) 60000 (c) 6000 (d) 12000
  7. 7.Which is closest to 1400 ÷ 21? (a) 35 (b) 700 (c) 140 (d) 70
  8. 8.Which is closest to 597 + 298 + 795? (a) 1600 (b) 1900 (c) 1700 (d) 1800
  9. 9.Which is closest to 1195 ÷ 39? (a) 15 (b) 60 (c) 30 (d) 300
  10. 10.Which is closest to 197 + 505 + 895? (a) 1600 (b) 1700 (c) 1800 (d) 1500
  11. 11.Which is closest to 299 + 405 + 195? (a) 1100 (b) 800 (c) 900 (d) 1000
  12. 12.Round 65903 to the nearest ten.
  13. 13.Which is closest to 601 × 48? (Round each number first.) (a) 60000 (b) 3000 (c) 30000 (d) 300000
  14. 14.Which is closest to 2695 ÷ 31? (a) 900 (b) 45 (c) 90 (d) 180
  15. 15.Round 55.14 to one decimal place. =
  16. 16.Round 55.33 to one decimal place. =
  17. 17.Round 49510 to the nearest thousand.
  18. 18.Round 59151 to the nearest hundred.
  19. 19.Round 44865 to the nearest hundred.
  20. 20.Which is closest to 196 + 297 + 600? (a) 1000 (b) 1300 (c) 1200 (d) 1100
  21. 21.Which is closest to 1191 ÷ 29? (a) 400 (b) 20 (c) 40 (d) 80
  22. 22.Which is closest to 2102 ÷ 29? (a) 140 (b) 35 (c) 70 (d) 700
  23. 23.Round 27.16 to one decimal place. =
  24. 24.Round 79458 to the nearest ten.
  25. 25.Which is closest to 303 + 296 + 805? (a) 1400 (b) 1600 (c) 1300 (d) 1500
  26. 26.Which is closest to 897 + 101 + 97? (a) 1200 (b) 1300 (c) 1100 (d) 1000
  27. 27.Which is closest to 196 × 58? (Round each number first.) (a) 1200 (b) 24000 (c) 120000 (d) 12000
  28. 28.Which is closest to 703 + 404 + 597? (a) 1600 (b) 1700 (c) 1900 (d) 1800
  29. 29.Which is closest to 1806 ÷ 19? (a) 900 (b) 45 (c) 90 (d) 180
  30. 30.Which is closest to 304 × 82? (Round each number first.) (a) 24000 (b) 240000 (c) 48000 (d) 2400
  31. 31.Which is closest to 97 + 602 + 197? (a) 800 (b) 1100 (c) 900 (d) 1000
  32. 32.Which is closest to 204 × 82? (Round each number first.) (a) 160000 (b) 32000 (c) 1600 (d) 16000
  33. 33.Which is closest to 203 × 70? (Round each number first.) (a) 140000 (b) 14000 (c) 1400 (d) 28000
  34. 34.Which is closest to 897 × 42? (Round each number first.) (a) 3600 (b) 72000 (c) 36000 (d) 360000
  35. 35.Which is closest to 896 × 60? (Round each number first.) (a) 108000 (b) 540000 (c) 54000 (d) 5400
  36. 36.Which is closest to 795 + 795 + 401? (a) 2200 (b) 2100 (c) 1900 (d) 2000
  37. 37.Which is closest to 2009 ÷ 39? (a) 100 (b) 25 (c) 500 (d) 50
  38. 38.Which is closest to 2999 ÷ 51? (a) 600 (b) 30 (c) 60 (d) 120
  39. 39.Which is closest to 403 + 397 + 96? (a) 900 (b) 800 (c) 1000 (d) 1100
  40. 40.Round 62.77 to one decimal place. =

Answer key

  1. 50
  2. 56000
  3. 60
  4. 12000
  5. 91000
  6. 6000
  7. 70
  8. 1700
  9. 30
  10. 1600
  11. 900
  12. 65900
  13. 30000
  14. 90
  15. 55.1
  16. 55.3
  17. 50000
  18. 59200
  19. 44900
  20. 1100
  21. 40
  22. 70
  23. 27.2
  24. 79460
  25. 1400
  26. 1100
  27. 12000
  28. 1700
  29. 90
  30. 24000
  31. 900
  32. 16000
  33. 14000
  34. 36000
  35. 54000
  36. 2000
  37. 50
  38. 60
  39. 900
  40. 62.8

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