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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 229 · 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 95 + 402 + 196? (a) 800 (b) 900 (c) 700 (d) 600
  2. 2.Which is closest to 604 × 90? (Round each number first.) (a) 5400 (b) 54000 (c) 108000 (d) 540000
  3. 3.Which is closest to 199 + 300 + 205? (a) 800 (b) 900 (c) 700 (d) 600
  4. 4.Round 19306 to the nearest hundred.
  5. 5.Which is closest to 796 × 92? (Round each number first.) (a) 72000 (b) 7200 (c) 720000 (d) 144000
  6. 6.Round 4347 to the nearest hundred.
  7. 7.Which is closest to 396 + 695 + 899? (a) 2200 (b) 1900 (c) 2000 (d) 2100
  8. 8.Which is closest to 195 + 695 + 195? (a) 1200 (b) 1000 (c) 1300 (d) 1100
  9. 9.Round 35808 to the nearest ten.
  10. 10.Which is closest to 800 + 605 + 801? (a) 2300 (b) 2400 (c) 2200 (d) 2100
  11. 11.Round 33021 to the nearest hundred.
  12. 12.Round 83156 to the nearest thousand.
  13. 13.Which is closest to 792 ÷ 41? (a) 40 (b) 20 (c) 200 (d) 10
  14. 14.Round 24267 to the nearest ten.
  15. 15.Round 56.27 to one decimal place. =
  16. 16.Round 87.42 to one decimal place. =
  17. 17.Round 43767 to the nearest ten.
  18. 18.Which is closest to 601 × 69? (Round each number first.) (a) 4200 (b) 420000 (c) 42000 (d) 84000
  19. 19.Round 49157 to the nearest hundred.
  20. 20.Which is closest to 1502 ÷ 49? (a) 300 (b) 15 (c) 60 (d) 30
  21. 21.Round 24610 to the nearest hundred.
  22. 22.Which is closest to 705 + 99 + 100? (a) 1000 (b) 900 (c) 1100 (d) 800
  23. 23.Which is closest to 501 × 69? (Round each number first.) (a) 3500 (b) 70000 (c) 350000 (d) 35000
  24. 24.Round 57754 to the nearest thousand.
  25. 25.Round 70784 to the nearest hundred.
  26. 26.Round 2933 to the nearest ten.
  27. 27.Which is closest to 399 × 40? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
  28. 28.Which is closest to 599 × 79? (Round each number first.) (a) 48000 (b) 4800 (c) 480000 (d) 96000
  29. 29.Which is closest to 704 + 797 + 595? (a) 2100 (b) 2300 (c) 2000 (d) 2200
  30. 30.Which is closest to 796 × 29? (Round each number first.) (a) 2400 (b) 24000 (c) 240000 (d) 48000
  31. 31.Which is closest to 200 × 72? (Round each number first.) (a) 1400 (b) 28000 (c) 14000 (d) 140000
  32. 32.Round 45770 to the nearest hundred.
  33. 33.Which is closest to 1004 ÷ 19? (a) 50 (b) 500 (c) 100 (d) 25
  34. 34.Round 15239 to the nearest thousand.
  35. 35.Which is closest to 597 + 601 + 395? (a) 1500 (b) 1600 (c) 1800 (d) 1700
  36. 36.Which is closest to 2403 ÷ 39? (a) 120 (b) 60 (c) 30 (d) 600
  37. 37.Which is closest to 704 + 404 + 201? (a) 1500 (b) 1400 (c) 1200 (d) 1300
  38. 38.Round 38.63 to one decimal place. =
  39. 39.Which is closest to 2096 ÷ 29? (a) 140 (b) 700 (c) 35 (d) 70
  40. 40.Which is closest to 1792 ÷ 21? (a) 900 (b) 180 (c) 45 (d) 90

Answer key

  1. 700
  2. 54000
  3. 700
  4. 19300
  5. 72000
  6. 4300
  7. 2000
  8. 1100
  9. 35810
  10. 2200
  11. 33000
  12. 83000
  13. 20
  14. 24270
  15. 56.3
  16. 87.4
  17. 43770
  18. 42000
  19. 49200
  20. 30
  21. 24600
  22. 900
  23. 35000
  24. 58000
  25. 70800
  26. 2930
  27. 16000
  28. 48000
  29. 2100
  30. 24000
  31. 14000
  32. 45800
  33. 50
  34. 15000
  35. 1600
  36. 60
  37. 1300
  38. 38.6
  39. 70
  40. 90

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