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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 325 · 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 297 × 42? (Round each number first.) (a) 12000 (b) 24000 (c) 120000 (d) 1200
  2. 2.Which is closest to 698 × 18? (Round each number first.) (a) 140000 (b) 28000 (c) 1400 (d) 14000
  3. 3.Round 69.18 to one decimal place. =
  4. 4.Which is closest to 195 + 698 + 99? (a) 1000 (b) 1100 (c) 900 (d) 1200
  5. 5.Which is closest to 795 + 96 + 401? (a) 1400 (b) 1300 (c) 1200 (d) 1500
  6. 6.Round 50.93 to one decimal place. =
  7. 7.Which is closest to 204 + 804 + 96? (a) 1000 (b) 1200 (c) 1300 (d) 1100
  8. 8.Round 50036 to the nearest ten.
  9. 9.Round 79918 to the nearest thousand.
  10. 10.Which is closest to 4006 ÷ 51? (a) 40 (b) 800 (c) 160 (d) 80
  11. 11.Which is closest to 800 × 28? (Round each number first.) (a) 24000 (b) 48000 (c) 240000 (d) 2400
  12. 12.Which is closest to 201 × 82? (Round each number first.) (a) 32000 (b) 16000 (c) 160000 (d) 1600
  13. 13.Which is closest to 299 + 199 + 195? (a) 900 (b) 600 (c) 700 (d) 800
  14. 14.Which is closest to 298 + 305 + 95? (a) 800 (b) 600 (c) 900 (d) 700
  15. 15.Which is closest to 900 × 49? (Round each number first.) (a) 450000 (b) 4500 (c) 90000 (d) 45000
  16. 16.Which is closest to 3496 ÷ 49? (a) 140 (b) 35 (c) 700 (d) 70
  17. 17.Round 97.31 to one decimal place. =
  18. 18.Which is closest to 505 + 798 + 804? (a) 2200 (b) 2300 (c) 2100 (d) 2000
  19. 19.Which is closest to 1500 ÷ 29? (a) 500 (b) 25 (c) 50 (d) 100
  20. 20.Round 38.44 to one decimal place. =
  21. 21.Which is closest to 400 ÷ 19? (a) 200 (b) 20 (c) 40 (d) 10
  22. 22.Which is closest to 1395 ÷ 19? (a) 70 (b) 140 (c) 35 (d) 700
  23. 23.Which is closest to 607 ÷ 29? (a) 40 (b) 200 (c) 10 (d) 20
  24. 24.Which is closest to 402 × 59? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  25. 25.Round 39.92 to one decimal place. =
  26. 26.Which is closest to 399 × 70? (Round each number first.) (a) 56000 (b) 28000 (c) 2800 (d) 280000
  27. 27.Round 37.94 to one decimal place. =
  28. 28.Round 90.26 to one decimal place. =
  29. 29.Which is closest to 701 + 896 + 499? (a) 2300 (b) 2100 (c) 2200 (d) 2000
  30. 30.Round 31.69 to one decimal place. =
  31. 31.Which is closest to 499 × 60? (Round each number first.) (a) 3000 (b) 300000 (c) 60000 (d) 30000
  32. 32.Round 90.82 to one decimal place. =
  33. 33.Round 38924 to the nearest thousand.
  34. 34.Which is closest to 396 × 92? (Round each number first.) (a) 3600 (b) 36000 (c) 360000 (d) 72000
  35. 35.Round 19.76 to one decimal place. =
  36. 36.Round 10.38 to one decimal place. =
  37. 37.Round 68197 to the nearest thousand.
  38. 38.Round 81.43 to one decimal place. =
  39. 39.Which is closest to 95 + 605 + 803? (a) 1500 (b) 1400 (c) 1700 (d) 1600
  40. 40.Round 89381 to the nearest hundred.

Answer key

  1. 12000
  2. 14000
  3. 69.2
  4. 1000
  5. 1300
  6. 50.9
  7. 1100
  8. 50040
  9. 80000
  10. 80
  11. 24000
  12. 16000
  13. 700
  14. 700
  15. 45000
  16. 70
  17. 97.3
  18. 2100
  19. 50
  20. 38.4
  21. 20
  22. 70
  23. 20
  24. 24000
  25. 39.9
  26. 28000
  27. 37.9
  28. 90.3
  29. 2100
  30. 31.7
  31. 30000
  32. 90.8
  33. 39000
  34. 36000
  35. 19.8
  36. 10.4
  37. 68000
  38. 81.4
  39. 1500
  40. 89400

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