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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 692 · 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.Round 73.34 to one decimal place. =
  2. 2.Which is closest to 2505 ÷ 51? (a) 50 (b) 100 (c) 500 (d) 25
  3. 3.Which is closest to 601 + 903 + 100? (a) 1800 (b) 1600 (c) 1500 (d) 1700
  4. 4.Which is closest to 301 × 39? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  5. 5.Which is closest to 1002 ÷ 49? (a) 10 (b) 20 (c) 40 (d) 200
  6. 6.Round 66249 to the nearest hundred.
  7. 7.Round 92.58 to one decimal place. =
  8. 8.Round 11739 to the nearest thousand.
  9. 9.Which is closest to 301 × 59? (Round each number first.) (a) 1800 (b) 18000 (c) 36000 (d) 180000
  10. 10.Which is closest to 202 + 197 + 698? (a) 1100 (b) 1000 (c) 1300 (d) 1200
  11. 11.Which is closest to 903 × 78? (Round each number first.) (a) 72000 (b) 7200 (c) 720000 (d) 144000
  12. 12.Round 21.66 to one decimal place. =
  13. 13.Round 89928 to the nearest thousand.
  14. 14.Which is closest to 599 ÷ 29? (a) 20 (b) 10 (c) 40 (d) 200
  15. 15.Which is closest to 802 + 597 + 805? (a) 2300 (b) 2200 (c) 2400 (d) 2100
  16. 16.Which is closest to 500 × 49? (Round each number first.) (a) 50000 (b) 2500 (c) 250000 (d) 25000
  17. 17.Which is closest to 303 × 21? (Round each number first.) (a) 6000 (b) 600 (c) 12000 (d) 60000
  18. 18.Which is closest to 599 + 100 + 499? (a) 1300 (b) 1400 (c) 1200 (d) 1100
  19. 19.Round 23816 to the nearest hundred.
  20. 20.Which is closest to 2809 ÷ 39? (a) 700 (b) 70 (c) 35 (d) 140
  21. 21.Round 83615 to the nearest hundred.
  22. 22.Which is closest to 901 × 60? (Round each number first.) (a) 5400 (b) 108000 (c) 540000 (d) 54000
  23. 23.Round 71711 to the nearest thousand.
  24. 24.Round 11844 to the nearest hundred.
  25. 25.Which is closest to 203 + 504 + 705? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  26. 26.Round 68796 to the nearest hundred.
  27. 27.Which is closest to 801 × 28? (Round each number first.) (a) 24000 (b) 240000 (c) 2400 (d) 48000
  28. 28.Which is closest to 2801 ÷ 41? (a) 700 (b) 70 (c) 35 (d) 140
  29. 29.Which is closest to 199 × 79? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  30. 30.Round 31.56 to one decimal place. =
  31. 31.Which is closest to 2508 ÷ 51? (a) 50 (b) 100 (c) 500 (d) 25
  32. 32.Round 14.28 to one decimal place. =
  33. 33.Which is closest to 398 × 29? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  34. 34.Round 11.61 to one decimal place. =
  35. 35.Round 81.94 to one decimal place. =
  36. 36.Which is closest to 199 × 88? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  37. 37.Which is closest to 297 × 48? (Round each number first.) (a) 15000 (b) 30000 (c) 1500 (d) 150000
  38. 38.Which is closest to 502 × 42? (Round each number first.) (a) 2000 (b) 200000 (c) 20000 (d) 40000
  39. 39.Round 67061 to the nearest ten.
  40. 40.Which is closest to 496 + 204 + 104? (a) 700 (b) 1000 (c) 800 (d) 900

Answer key

  1. 73.3
  2. 50
  3. 1600
  4. 12000
  5. 20
  6. 66200
  7. 92.6
  8. 12000
  9. 18000
  10. 1100
  11. 72000
  12. 21.7
  13. 90000
  14. 20
  15. 2200
  16. 25000
  17. 6000
  18. 1200
  19. 23800
  20. 70
  21. 83600
  22. 54000
  23. 72000
  24. 11800
  25. 1400
  26. 68800
  27. 24000
  28. 70
  29. 16000
  30. 31.6
  31. 50
  32. 14.3
  33. 12000
  34. 11.6
  35. 81.9
  36. 18000
  37. 15000
  38. 20000
  39. 67060
  40. 800

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