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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 961 · 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 805 ÷ 41? (a) 20 (b) 200 (c) 40 (d) 10
  2. 2.Which is closest to 1194 ÷ 19? (a) 120 (b) 30 (c) 60 (d) 600
  3. 3.Round 29.39 to one decimal place. =
  4. 4.Which is closest to 399 + 805 + 695? (a) 1800 (b) 1900 (c) 2000 (d) 2100
  5. 5.Which is closest to 802 × 51? (Round each number first.) (a) 4000 (b) 40000 (c) 400000 (d) 80000
  6. 6.Round 57.23 to one decimal place. =
  7. 7.Round 2389 to the nearest thousand.
  8. 8.Which is closest to 504 × 62? (Round each number first.) (a) 60000 (b) 300000 (c) 30000 (d) 3000
  9. 9.Which is closest to 799 + 202 + 903? (a) 1800 (b) 2000 (c) 1900 (d) 2100
  10. 10.Which is closest to 296 × 90? (Round each number first.) (a) 54000 (b) 27000 (c) 270000 (d) 2700
  11. 11.Which is closest to 905 ÷ 29? (a) 300 (b) 15 (c) 30 (d) 60
  12. 12.Round 65.17 to one decimal place. =
  13. 13.Which is closest to 3003 ÷ 51? (a) 60 (b) 120 (c) 600 (d) 30
  14. 14.Which is closest to 898 × 82? (Round each number first.) (a) 72000 (b) 720000 (c) 144000 (d) 7200
  15. 15.Which is closest to 103 + 705 + 196? (a) 900 (b) 1100 (c) 1000 (d) 1200
  16. 16.Round 63.11 to one decimal place. =
  17. 17.Round 50.48 to one decimal place. =
  18. 18.Which is closest to 801 + 297 + 196? (a) 1400 (b) 1300 (c) 1200 (d) 1500
  19. 19.Which is closest to 2792 ÷ 39? (a) 140 (b) 700 (c) 70 (d) 35
  20. 20.Round 10.09 to one decimal place. =
  21. 21.Which is closest to 204 × 31? (Round each number first.) (a) 12000 (b) 600 (c) 6000 (d) 60000
  22. 22.Which is closest to 796 + 695 + 901? (a) 2600 (b) 2400 (c) 2300 (d) 2500
  23. 23.Round 64706 to the nearest ten.
  24. 24.Which is closest to 296 × 39? (Round each number first.) (a) 120000 (b) 24000 (c) 1200 (d) 12000
  25. 25.Round 11580 to the nearest thousand.
  26. 26.Which is closest to 4493 ÷ 51? (a) 90 (b) 180 (c) 900 (d) 45
  27. 27.Round 41.72 to one decimal place. =
  28. 28.Which is closest to 1401 ÷ 19? (a) 700 (b) 140 (c) 35 (d) 70
  29. 29.Which is closest to 1592 ÷ 39? (a) 40 (b) 20 (c) 400 (d) 80
  30. 30.Round 70165 to the nearest hundred.
  31. 31.Which is closest to 3594 ÷ 41? (a) 45 (b) 90 (c) 180 (d) 900
  32. 32.Round 60534 to the nearest thousand.
  33. 33.Round 2690 to the nearest hundred.
  34. 34.Round 71.09 to one decimal place. =
  35. 35.Which is closest to 902 × 21? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
  36. 36.Which is closest to 796 + 195 + 99? (a) 1300 (b) 1000 (c) 1200 (d) 1100
  37. 37.Round 71762 to the nearest thousand.
  38. 38.Which is closest to 1491 ÷ 49? (a) 15 (b) 30 (c) 60 (d) 300
  39. 39.Which is closest to 496 + 195 + 598? (a) 1400 (b) 1500 (c) 1300 (d) 1200
  40. 40.Which is closest to 399 × 28? (Round each number first.) (a) 120000 (b) 1200 (c) 12000 (d) 24000

Answer key

  1. 20
  2. 60
  3. 29.4
  4. 1900
  5. 40000
  6. 57.2
  7. 2000
  8. 30000
  9. 1900
  10. 27000
  11. 30
  12. 65.2
  13. 60
  14. 72000
  15. 1000
  16. 63.1
  17. 50.5
  18. 1300
  19. 70
  20. 10.1
  21. 6000
  22. 2400
  23. 64710
  24. 12000
  25. 12000
  26. 90
  27. 41.7
  28. 70
  29. 40
  30. 70200
  31. 90
  32. 61000
  33. 2700
  34. 71.1
  35. 18000
  36. 1100
  37. 72000
  38. 30
  39. 1300
  40. 12000

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