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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 867 · 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 2797 ÷ 41? (a) 700 (b) 70 (c) 35 (d) 140
  2. 2.Which is closest to 504 × 31? (Round each number first.) (a) 1500 (b) 150000 (c) 15000 (d) 30000
  3. 3.Round 84.84 to one decimal place. =
  4. 4.Which is closest to 1207 ÷ 39? (a) 300 (b) 60 (c) 30 (d) 15
  5. 5.Which is closest to 796 × 58? (Round each number first.) (a) 96000 (b) 48000 (c) 4800 (d) 480000
  6. 6.Which is closest to 3495 ÷ 51? (a) 140 (b) 700 (c) 35 (d) 70
  7. 7.Round 89.42 to one decimal place. =
  8. 8.Round 41.09 to one decimal place. =
  9. 9.Which is closest to 897 + 302 + 397? (a) 1600 (b) 1700 (c) 1500 (d) 1800
  10. 10.Which is closest to 796 × 22? (Round each number first.) (a) 1600 (b) 16000 (c) 160000 (d) 32000
  11. 11.Round 29.36 to one decimal place. =
  12. 12.Which is closest to 1600 ÷ 39? (a) 40 (b) 80 (c) 400 (d) 20
  13. 13.Which is closest to 502 + 599 + 96? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  14. 14.Which is closest to 1191 ÷ 19? (a) 120 (b) 600 (c) 30 (d) 60
  15. 15.Which is closest to 803 + 101 + 805? (a) 1900 (b) 1800 (c) 1700 (d) 1600
  16. 16.Round 46909 to the nearest ten.
  17. 17.Which is closest to 304 × 90? (Round each number first.) (a) 54000 (b) 27000 (c) 270000 (d) 2700
  18. 18.Which is closest to 599 × 69? (Round each number first.) (a) 84000 (b) 42000 (c) 420000 (d) 4200
  19. 19.Which is closest to 600 × 28? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
  20. 20.Round 96.94 to one decimal place. =
  21. 21.Round 5461 to the nearest hundred.
  22. 22.Which is closest to 596 ÷ 31? (a) 200 (b) 40 (c) 10 (d) 20
  23. 23.Which is closest to 2501 ÷ 51? (a) 100 (b) 25 (c) 500 (d) 50
  24. 24.Which is closest to 896 ÷ 31? (a) 15 (b) 300 (c) 30 (d) 60
  25. 25.Round 55441 to the nearest thousand.
  26. 26.Which is closest to 597 × 50? (Round each number first.) (a) 60000 (b) 30000 (c) 3000 (d) 300000
  27. 27.Which is closest to 298 + 300 + 599? (a) 1100 (b) 1300 (c) 1200 (d) 1400
  28. 28.Round 75.93 to one decimal place. =
  29. 29.Round 80.34 to one decimal place. =
  30. 30.Which is closest to 702 + 397 + 399? (a) 1700 (b) 1600 (c) 1500 (d) 1400
  31. 31.Which is closest to 596 × 91? (Round each number first.) (a) 108000 (b) 54000 (c) 540000 (d) 5400
  32. 32.Round 40.68 to one decimal place. =
  33. 33.Which is closest to 701 + 105 + 700? (a) 1400 (b) 1600 (c) 1700 (d) 1500
  34. 34.Which is closest to 798 ÷ 19? (a) 40 (b) 20 (c) 400 (d) 80
  35. 35.Round 21384 to the nearest thousand.
  36. 36.Which is closest to 296 × 91? (Round each number first.) (a) 54000 (b) 27000 (c) 270000 (d) 2700
  37. 37.Which is closest to 202 × 92? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  38. 38.Which is closest to 3603 ÷ 39? (a) 45 (b) 180 (c) 90 (d) 900
  39. 39.Which is closest to 2504 ÷ 51? (a) 100 (b) 25 (c) 50 (d) 500
  40. 40.Which is closest to 800 × 32? (Round each number first.) (a) 2400 (b) 240000 (c) 24000 (d) 48000

Answer key

  1. 70
  2. 15000
  3. 84.8
  4. 30
  5. 48000
  6. 70
  7. 89.4
  8. 41.1
  9. 1600
  10. 16000
  11. 29.4
  12. 40
  13. 1200
  14. 60
  15. 1700
  16. 46910
  17. 27000
  18. 42000
  19. 18000
  20. 96.9
  21. 5500
  22. 20
  23. 50
  24. 30
  25. 55000
  26. 30000
  27. 1200
  28. 75.9
  29. 80.3
  30. 1500
  31. 54000
  32. 40.7
  33. 1500
  34. 40
  35. 21000
  36. 27000
  37. 18000
  38. 90
  39. 50
  40. 24000

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