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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 996 · 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 52.37 to one decimal place. =
  2. 2.Which is closest to 604 × 70? (Round each number first.) (a) 4200 (b) 84000 (c) 42000 (d) 420000
  3. 3.Which is closest to 899 × 30? (Round each number first.) (a) 54000 (b) 270000 (c) 27000 (d) 2700
  4. 4.Which is closest to 798 × 31? (Round each number first.) (a) 2400 (b) 24000 (c) 240000 (d) 48000
  5. 5.Which is closest to 298 × 92? (Round each number first.) (a) 27000 (b) 2700 (c) 54000 (d) 270000
  6. 6.Round 4356 to the nearest hundred.
  7. 7.Which is closest to 809 ÷ 41? (a) 20 (b) 10 (c) 200 (d) 40
  8. 8.Which is closest to 200 + 196 + 104? (a) 700 (b) 500 (c) 600 (d) 400
  9. 9.Which is closest to 204 + 104 + 304? (a) 700 (b) 800 (c) 600 (d) 500
  10. 10.Round 40.73 to one decimal place. =
  11. 11.Round 22615 to the nearest hundred.
  12. 12.Which is closest to 202 + 605 + 301? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  13. 13.Round 34.42 to one decimal place. =
  14. 14.Round 43848 to the nearest hundred.
  15. 15.Which is closest to 297 + 695 + 601? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  16. 16.Which is closest to 800 × 38? (Round each number first.) (a) 64000 (b) 320000 (c) 32000 (d) 3200
  17. 17.Which is closest to 197 × 90? (Round each number first.) (a) 180000 (b) 18000 (c) 1800 (d) 36000
  18. 18.Which is closest to 2793 ÷ 39? (a) 35 (b) 140 (c) 700 (d) 70
  19. 19.Which is closest to 997 ÷ 21? (a) 25 (b) 100 (c) 50 (d) 500
  20. 20.Round 88.93 to one decimal place. =
  21. 21.Round 98.82 to one decimal place. =
  22. 22.Which is closest to 699 × 21? (Round each number first.) (a) 1400 (b) 140000 (c) 28000 (d) 14000
  23. 23.Round 82997 to the nearest ten.
  24. 24.Which is closest to 901 × 40? (Round each number first.) (a) 72000 (b) 3600 (c) 360000 (d) 36000
  25. 25.Round 70.23 to one decimal place. =
  26. 26.Round 23967 to the nearest hundred.
  27. 27.Round 7623 to the nearest ten.
  28. 28.Which is closest to 702 × 49? (Round each number first.) (a) 35000 (b) 3500 (c) 350000 (d) 70000
  29. 29.Which is closest to 2696 ÷ 29? (a) 45 (b) 180 (c) 90 (d) 900
  30. 30.Which is closest to 2995 ÷ 51? (a) 60 (b) 30 (c) 600 (d) 120
  31. 31.Which is closest to 603 × 59? (Round each number first.) (a) 3600 (b) 360000 (c) 72000 (d) 36000
  32. 32.Which is closest to 3492 ÷ 49? (a) 70 (b) 140 (c) 35 (d) 700
  33. 33.Which is closest to 1392 ÷ 21? (a) 700 (b) 70 (c) 35 (d) 140
  34. 34.Which is closest to 904 × 28? (Round each number first.) (a) 54000 (b) 270000 (c) 2700 (d) 27000
  35. 35.Round 49.08 to one decimal place. =
  36. 36.Which is closest to 705 + 396 + 399? (a) 1700 (b) 1600 (c) 1500 (d) 1400
  37. 37.Round 84451 to the nearest ten.
  38. 38.Which is closest to 599 × 19? (Round each number first.) (a) 120000 (b) 12000 (c) 24000 (d) 1200
  39. 39.Which is closest to 800 + 397 + 205? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  40. 40.Round 30.54 to one decimal place. =

Answer key

  1. 52.4
  2. 42000
  3. 27000
  4. 24000
  5. 27000
  6. 4400
  7. 20
  8. 500
  9. 600
  10. 40.7
  11. 22600
  12. 1100
  13. 34.4
  14. 43800
  15. 1600
  16. 32000
  17. 18000
  18. 70
  19. 50
  20. 88.9
  21. 98.8
  22. 14000
  23. 83000
  24. 36000
  25. 70.2
  26. 24000
  27. 7620
  28. 35000
  29. 90
  30. 60
  31. 36000
  32. 70
  33. 70
  34. 27000
  35. 49.1
  36. 1500
  37. 84450
  38. 12000
  39. 1400
  40. 30.5

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