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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 383 · 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 201 × 80? (Round each number first.) (a) 32000 (b) 16000 (c) 1600 (d) 160000
  2. 2.Round 37.34 to one decimal place. =
  3. 3.Which is closest to 1807 ÷ 19? (a) 180 (b) 900 (c) 45 (d) 90
  4. 4.Round 76411 to the nearest ten.
  5. 5.Round 36607 to the nearest hundred.
  6. 6.Round 4801 to the nearest hundred.
  7. 7.Which is closest to 298 × 28? (Round each number first.) (a) 90000 (b) 9000 (c) 900 (d) 18000
  8. 8.Which is closest to 298 + 905 + 397? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  9. 9.Which is closest to 304 + 404 + 297? (a) 1000 (b) 1100 (c) 900 (d) 1200
  10. 10.Round 54944 to the nearest ten.
  11. 11.Which is closest to 400 × 59? (Round each number first.) (a) 24000 (b) 240000 (c) 2400 (d) 48000
  12. 12.Which is closest to 204 + 897 + 202? (a) 1500 (b) 1300 (c) 1400 (d) 1200
  13. 13.Round 16183 to the nearest hundred.
  14. 14.Round 26.52 to one decimal place. =
  15. 15.Round 92.34 to one decimal place. =
  16. 16.Which is closest to 1992 ÷ 51? (a) 40 (b) 20 (c) 400 (d) 80
  17. 17.Which is closest to 398 × 32? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  18. 18.Which is closest to 2803 ÷ 41? (a) 700 (b) 35 (c) 70 (d) 140
  19. 19.Which is closest to 1206 ÷ 19? (a) 30 (b) 600 (c) 60 (d) 120
  20. 20.Which is closest to 902 + 198 + 501? (a) 1600 (b) 1500 (c) 1800 (d) 1700
  21. 21.Which is closest to 401 × 59? (Round each number first.) (a) 240000 (b) 2400 (c) 24000 (d) 48000
  22. 22.Which is closest to 801 × 60? (Round each number first.) (a) 4800 (b) 480000 (c) 48000 (d) 96000
  23. 23.Which is closest to 604 ÷ 29? (a) 200 (b) 40 (c) 10 (d) 20
  24. 24.Which is closest to 97 + 795 + 705? (a) 1800 (b) 1500 (c) 1600 (d) 1700
  25. 25.Round 48.44 to one decimal place. =
  26. 26.Which is closest to 399 × 58? (Round each number first.) (a) 2400 (b) 48000 (c) 240000 (d) 24000
  27. 27.Round 55.16 to one decimal place. =
  28. 28.Which is closest to 2401 ÷ 29? (a) 800 (b) 160 (c) 80 (d) 40
  29. 29.Which is closest to 2806 ÷ 41? (a) 35 (b) 140 (c) 700 (d) 70
  30. 30.Round 92321 to the nearest hundred.
  31. 31.Round 80263 to the nearest ten.
  32. 32.Which is closest to 702 × 30? (Round each number first.) (a) 42000 (b) 2100 (c) 21000 (d) 210000
  33. 33.Round 80.81 to one decimal place. =
  34. 34.Which is closest to 504 × 62? (Round each number first.) (a) 3000 (b) 60000 (c) 30000 (d) 300000
  35. 35.Which is closest to 195 + 404 + 603? (a) 1400 (b) 1200 (c) 1100 (d) 1300
  36. 36.Round 20834 to the nearest ten.
  37. 37.Which is closest to 903 × 81? (Round each number first.) (a) 144000 (b) 72000 (c) 7200 (d) 720000
  38. 38.Which is closest to 2993 ÷ 49? (a) 120 (b) 60 (c) 600 (d) 30
  39. 39.Which is closest to 701 × 69? (Round each number first.) (a) 490000 (b) 49000 (c) 98000 (d) 4900
  40. 40.Which is closest to 2706 ÷ 29? (a) 900 (b) 45 (c) 180 (d) 90

Answer key

  1. 16000
  2. 37.3
  3. 90
  4. 76410
  5. 36600
  6. 4800
  7. 9000
  8. 1600
  9. 1000
  10. 54940
  11. 24000
  12. 1300
  13. 16200
  14. 26.5
  15. 92.3
  16. 40
  17. 12000
  18. 70
  19. 60
  20. 1600
  21. 24000
  22. 48000
  23. 20
  24. 1600
  25. 48.4
  26. 24000
  27. 55.2
  28. 80
  29. 70
  30. 92300
  31. 80260
  32. 21000
  33. 80.8
  34. 30000
  35. 1200
  36. 20830
  37. 72000
  38. 60
  39. 49000
  40. 90

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