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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 819 · 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 3997 ÷ 49? (a) 80 (b) 800 (c) 160 (d) 40
  2. 2.Which is closest to 1002 ÷ 19? (a) 25 (b) 100 (c) 500 (d) 50
  3. 3.Which is closest to 101 + 902 + 297? (a) 1500 (b) 1300 (c) 1200 (d) 1400
  4. 4.Which is closest to 802 × 39? (Round each number first.) (a) 320000 (b) 3200 (c) 32000 (d) 64000
  5. 5.Which is closest to 201 × 51? (Round each number first.) (a) 10000 (b) 1000 (c) 20000 (d) 100000
  6. 6.Which is closest to 501 × 88? (Round each number first.) (a) 4500 (b) 450000 (c) 90000 (d) 45000
  7. 7.Which is closest to 105 + 696 + 401? (a) 1400 (b) 1300 (c) 1100 (d) 1200
  8. 8.Which is closest to 803 × 31? (Round each number first.) (a) 240000 (b) 2400 (c) 48000 (d) 24000
  9. 9.Which is closest to 199 × 18? (Round each number first.) (a) 400 (b) 8000 (c) 4000 (d) 40000
  10. 10.Which is closest to 1195 ÷ 19? (a) 600 (b) 120 (c) 30 (d) 60
  11. 11.Round 41106 to the nearest thousand.
  12. 12.Round 68522 to the nearest ten.
  13. 13.Which is closest to 899 × 89? (Round each number first.) (a) 162000 (b) 8100 (c) 810000 (d) 81000
  14. 14.Which is closest to 2391 ÷ 31? (a) 800 (b) 40 (c) 80 (d) 160
  15. 15.Which is closest to 497 × 48? (Round each number first.) (a) 2500 (b) 50000 (c) 25000 (d) 250000
  16. 16.Round 52.29 to one decimal place. =
  17. 17.Which is closest to 1593 ÷ 19? (a) 80 (b) 800 (c) 40 (d) 160
  18. 18.Which is closest to 792 ÷ 41? (a) 20 (b) 40 (c) 10 (d) 200
  19. 19.Which is closest to 503 × 72? (Round each number first.) (a) 70000 (b) 35000 (c) 3500 (d) 350000
  20. 20.Which is closest to 501 + 200 + 301? (a) 1100 (b) 1200 (c) 1000 (d) 900
  21. 21.Which is closest to 301 + 100 + 104? (a) 500 (b) 700 (c) 400 (d) 600
  22. 22.Round 24.24 to one decimal place. =
  23. 23.Round 87.59 to one decimal place. =
  24. 24.Round 19633 to the nearest thousand.
  25. 25.Which is closest to 497 × 68? (Round each number first.) (a) 350000 (b) 3500 (c) 35000 (d) 70000
  26. 26.Which is closest to 801 ÷ 19? (a) 400 (b) 20 (c) 80 (d) 40
  27. 27.Round 12.07 to one decimal place. =
  28. 28.Round 31137 to the nearest hundred.
  29. 29.Which is closest to 297 × 82? (Round each number first.) (a) 240000 (b) 48000 (c) 24000 (d) 2400
  30. 30.Round 69.46 to one decimal place. =
  31. 31.Round 20009 to the nearest ten.
  32. 32.Which is closest to 497 × 88? (Round each number first.) (a) 90000 (b) 4500 (c) 45000 (d) 450000
  33. 33.Which is closest to 300 × 61? (Round each number first.) (a) 36000 (b) 18000 (c) 180000 (d) 1800
  34. 34.Round 12.79 to one decimal place. =
  35. 35.Which is closest to 897 × 51? (Round each number first.) (a) 450000 (b) 45000 (c) 4500 (d) 90000
  36. 36.Round 14.48 to one decimal place. =
  37. 37.Which is closest to 698 + 200 + 101? (a) 1200 (b) 1100 (c) 900 (d) 1000
  38. 38.Which is closest to 100 + 204 + 105? (a) 600 (b) 400 (c) 500 (d) 300
  39. 39.Which is closest to 204 × 21? (Round each number first.) (a) 8000 (b) 4000 (c) 400 (d) 40000
  40. 40.Which is closest to 1504 ÷ 49? (a) 15 (b) 30 (c) 300 (d) 60

Answer key

  1. 80
  2. 50
  3. 1300
  4. 32000
  5. 10000
  6. 45000
  7. 1200
  8. 24000
  9. 4000
  10. 60
  11. 41000
  12. 68520
  13. 81000
  14. 80
  15. 25000
  16. 52.3
  17. 80
  18. 20
  19. 35000
  20. 1000
  21. 500
  22. 24.2
  23. 87.6
  24. 20000
  25. 35000
  26. 40
  27. 12.1
  28. 31100
  29. 24000
  30. 69.5
  31. 20010
  32. 45000
  33. 18000
  34. 12.8
  35. 45000
  36. 14.5
  37. 1000
  38. 400
  39. 4000
  40. 30

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