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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 813 · 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 2798 ÷ 41? (a) 700 (b) 140 (c) 35 (d) 70
  2. 2.Round 35948 to the nearest hundred.
  3. 3.Round 29429 to the nearest ten.
  4. 4.Which is closest to 896 × 32? (Round each number first.) (a) 54000 (b) 27000 (c) 2700 (d) 270000
  5. 5.Which is closest to 1208 ÷ 39? (a) 15 (b) 60 (c) 30 (d) 300
  6. 6.Which is closest to 101 + 96 + 103? (a) 500 (b) 200 (c) 300 (d) 400
  7. 7.Which is closest to 2708 ÷ 29? (a) 180 (b) 900 (c) 90 (d) 45
  8. 8.Which is closest to 301 + 698 + 98? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  9. 9.Round 49.17 to one decimal place. =
  10. 10.Round 16.68 to one decimal place. =
  11. 11.Which is closest to 597 × 18? (Round each number first.) (a) 1200 (b) 12000 (c) 24000 (d) 120000
  12. 12.Round 58.74 to one decimal place. =
  13. 13.Round 94539 to the nearest hundred.
  14. 14.Which is closest to 302 × 19? (Round each number first.) (a) 12000 (b) 6000 (c) 600 (d) 60000
  15. 15.Which is closest to 603 × 39? (Round each number first.) (a) 24000 (b) 2400 (c) 48000 (d) 240000
  16. 16.Which is closest to 303 × 48? (Round each number first.) (a) 1500 (b) 150000 (c) 30000 (d) 15000
  17. 17.Which is closest to 501 + 896 + 96? (a) 1400 (b) 1600 (c) 1700 (d) 1500
  18. 18.Round 63.08 to one decimal place. =
  19. 19.Which is closest to 802 + 901 + 505? (a) 2300 (b) 2100 (c) 2200 (d) 2400
  20. 20.Which is closest to 404 × 19? (Round each number first.) (a) 8000 (b) 16000 (c) 80000 (d) 800
  21. 21.Which is closest to 2398 ÷ 29? (a) 40 (b) 160 (c) 80 (d) 800
  22. 22.Round 12037 to the nearest hundred.
  23. 23.Which is closest to 903 + 796 + 95? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  24. 24.Which is closest to 3600 ÷ 39? (a) 90 (b) 45 (c) 180 (d) 900
  25. 25.Which is closest to 396 × 72? (Round each number first.) (a) 56000 (b) 2800 (c) 28000 (d) 280000
  26. 26.Round 99469 to the nearest ten.
  27. 27.Which is closest to 1192 ÷ 39? (a) 15 (b) 60 (c) 30 (d) 300
  28. 28.Which is closest to 696 × 29? (Round each number first.) (a) 21000 (b) 2100 (c) 42000 (d) 210000
  29. 29.Which is closest to 604 × 31? (Round each number first.) (a) 1800 (b) 180000 (c) 18000 (d) 36000
  30. 30.Round 98510 to the nearest hundred.
  31. 31.Which is closest to 100 + 802 + 303? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  32. 32.Round 95.78 to one decimal place. =
  33. 33.Which is closest to 1192 ÷ 41? (a) 300 (b) 60 (c) 15 (d) 30
  34. 34.Which is closest to 300 + 301 + 905? (a) 1400 (b) 1600 (c) 1500 (d) 1700
  35. 35.Round 58.19 to one decimal place. =
  36. 36.Which is closest to 902 × 22? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  37. 37.Round 27371 to the nearest thousand.
  38. 38.Round 31712 to the nearest thousand.
  39. 39.Which is closest to 700 × 29? (Round each number first.) (a) 2100 (b) 21000 (c) 210000 (d) 42000
  40. 40.Round 73.11 to one decimal place. =

Answer key

  1. 70
  2. 35900
  3. 29430
  4. 27000
  5. 30
  6. 300
  7. 90
  8. 1100
  9. 49.2
  10. 16.7
  11. 12000
  12. 58.7
  13. 94500
  14. 6000
  15. 24000
  16. 15000
  17. 1500
  18. 63.1
  19. 2200
  20. 8000
  21. 80
  22. 12000
  23. 1800
  24. 90
  25. 28000
  26. 99470
  27. 30
  28. 21000
  29. 18000
  30. 98500
  31. 1200
  32. 95.8
  33. 30
  34. 1500
  35. 58.2
  36. 18000
  37. 27000
  38. 32000
  39. 21000
  40. 73.1

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