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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 204 · 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 2709 ÷ 29? (a) 180 (b) 45 (c) 900 (d) 90
  2. 2.Round 27300 to the nearest thousand.
  3. 3.Which is closest to 697 × 30? (Round each number first.) (a) 2100 (b) 210000 (c) 21000 (d) 42000
  4. 4.Which is closest to 705 + 900 + 99? (a) 1800 (b) 1700 (c) 1600 (d) 1900
  5. 5.Round 81.18 to one decimal place. =
  6. 6.Which is closest to 299 + 198 + 805? (a) 1200 (b) 1400 (c) 1500 (d) 1300
  7. 7.Round 59241 to the nearest ten.
  8. 8.Which is closest to 95 + 104 + 404? (a) 500 (b) 600 (c) 800 (d) 700
  9. 9.Round 88732 to the nearest hundred.
  10. 10.Which is closest to 1000 ÷ 19? (a) 500 (b) 25 (c) 50 (d) 100
  11. 11.Which is closest to 503 + 105 + 898? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  12. 12.Which is closest to 804 × 61? (Round each number first.) (a) 480000 (b) 96000 (c) 4800 (d) 48000
  13. 13.Which is closest to 498 × 92? (Round each number first.) (a) 450000 (b) 4500 (c) 45000 (d) 90000
  14. 14.Which is closest to 603 × 58? (Round each number first.) (a) 360000 (b) 36000 (c) 72000 (d) 3600
  15. 15.Round 43452 to the nearest ten.
  16. 16.Which is closest to 602 × 80? (Round each number first.) (a) 96000 (b) 480000 (c) 48000 (d) 4800
  17. 17.Round 12.61 to one decimal place. =
  18. 18.Which is closest to 1596 ÷ 41? (a) 80 (b) 40 (c) 20 (d) 400
  19. 19.Which is closest to 405 + 500 + 505? (a) 1400 (b) 1500 (c) 1300 (d) 1600
  20. 20.Which is closest to 602 + 504 + 902? (a) 2000 (b) 2200 (c) 1900 (d) 2100
  21. 21.Which is closest to 809 ÷ 21? (a) 80 (b) 40 (c) 20 (d) 400
  22. 22.Round 16786 to the nearest hundred.
  23. 23.Which is closest to 202 × 50? (Round each number first.) (a) 1000 (b) 20000 (c) 10000 (d) 100000
  24. 24.Which is closest to 797 + 797 + 397? (a) 2100 (b) 2000 (c) 1900 (d) 2200
  25. 25.Round 37664 to the nearest thousand.
  26. 26.Round 73.76 to one decimal place. =
  27. 27.Which is closest to 601 × 52? (Round each number first.) (a) 60000 (b) 30000 (c) 300000 (d) 3000
  28. 28.Round 27.18 to one decimal place. =
  29. 29.Which is closest to 898 × 52? (Round each number first.) (a) 45000 (b) 4500 (c) 90000 (d) 450000
  30. 30.Which is closest to 195 + 400 + 803? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  31. 31.Which is closest to 199 × 22? (Round each number first.) (a) 4000 (b) 8000 (c) 400 (d) 40000
  32. 32.Which is closest to 497 + 303 + 604? (a) 1300 (b) 1400 (c) 1500 (d) 1600
  33. 33.Which is closest to 1001 ÷ 21? (a) 500 (b) 50 (c) 100 (d) 25
  34. 34.Round 25.44 to one decimal place. =
  35. 35.Which is closest to 799 × 88? (Round each number first.) (a) 72000 (b) 144000 (c) 720000 (d) 7200
  36. 36.Round 63.28 to one decimal place. =
  37. 37.Which is closest to 400 × 32? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  38. 38.Which is closest to 497 + 895 + 695? (a) 2200 (b) 2300 (c) 2100 (d) 2000
  39. 39.Which is closest to 397 × 90? (Round each number first.) (a) 3600 (b) 72000 (c) 36000 (d) 360000
  40. 40.Round 76.44 to one decimal place. =

Answer key

  1. 90
  2. 27000
  3. 21000
  4. 1700
  5. 81.2
  6. 1300
  7. 59240
  8. 600
  9. 88700
  10. 50
  11. 1500
  12. 48000
  13. 45000
  14. 36000
  15. 43450
  16. 48000
  17. 12.6
  18. 40
  19. 1400
  20. 2000
  21. 40
  22. 16800
  23. 10000
  24. 2000
  25. 38000
  26. 73.8
  27. 30000
  28. 27.2
  29. 45000
  30. 1400
  31. 4000
  32. 1400
  33. 50
  34. 25.4
  35. 72000
  36. 63.3
  37. 12000
  38. 2100
  39. 36000
  40. 76.4

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