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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 811 · 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 2496 ÷ 49? (a) 25 (b) 50 (c) 500 (d) 100
  2. 2.Which is closest to 801 + 195 + 95? (a) 1200 (b) 1300 (c) 1100 (d) 1000
  3. 3.Which is closest to 598 × 62? (Round each number first.) (a) 72000 (b) 360000 (c) 36000 (d) 3600
  4. 4.Which is closest to 896 × 41? (Round each number first.) (a) 36000 (b) 3600 (c) 72000 (d) 360000
  5. 5.Round 50971 to the nearest ten.
  6. 6.Which is closest to 403 × 49? (Round each number first.) (a) 20000 (b) 2000 (c) 40000 (d) 200000
  7. 7.Which is closest to 698 + 97 + 205? (a) 1200 (b) 900 (c) 1100 (d) 1000
  8. 8.Round 81683 to the nearest hundred.
  9. 9.Which is closest to 701 × 79? (Round each number first.) (a) 5600 (b) 56000 (c) 112000 (d) 560000
  10. 10.Round 30.76 to one decimal place. =
  11. 11.Which is closest to 1499 ÷ 29? (a) 50 (b) 500 (c) 100 (d) 25
  12. 12.Which is closest to 592 ÷ 29? (a) 40 (b) 200 (c) 10 (d) 20
  13. 13.Which is closest to 496 × 68? (Round each number first.) (a) 3500 (b) 35000 (c) 350000 (d) 70000
  14. 14.Which is closest to 800 × 48? (Round each number first.) (a) 40000 (b) 400000 (c) 80000 (d) 4000
  15. 15.Round 10.12 to one decimal place. =
  16. 16.Which is closest to 1594 ÷ 39? (a) 400 (b) 20 (c) 40 (d) 80
  17. 17.Round 24772 to the nearest thousand.
  18. 18.Round 60936 to the nearest hundred.
  19. 19.Which is closest to 2092 ÷ 29? (a) 70 (b) 140 (c) 35 (d) 700
  20. 20.Round 18.71 to one decimal place. =
  21. 21.Which is closest to 800 + 301 + 898? (a) 2200 (b) 2100 (c) 2000 (d) 1900
  22. 22.Which is closest to 400 + 199 + 603? (a) 1100 (b) 1200 (c) 1300 (d) 1400
  23. 23.Which is closest to 3198 ÷ 41? (a) 160 (b) 80 (c) 800 (d) 40
  24. 24.Round 75096 to the nearest ten.
  25. 25.Which is closest to 500 + 299 + 198? (a) 1100 (b) 1200 (c) 900 (d) 1000
  26. 26.Round 59436 to the nearest ten.
  27. 27.Which is closest to 104 + 903 + 600? (a) 1700 (b) 1800 (c) 1600 (d) 1500
  28. 28.Which is closest to 302 + 298 + 198? (a) 800 (b) 1000 (c) 700 (d) 900
  29. 29.Which is closest to 202 + 297 + 200? (a) 900 (b) 600 (c) 700 (d) 800
  30. 30.Which is closest to 991 ÷ 19? (a) 50 (b) 100 (c) 25 (d) 500
  31. 31.Round 69.89 to one decimal place. =
  32. 32.Which is closest to 699 × 32? (Round each number first.) (a) 21000 (b) 210000 (c) 42000 (d) 2100
  33. 33.Round 51119 to the nearest thousand.
  34. 34.Round 38.89 to one decimal place. =
  35. 35.Round 97714 to the nearest ten.
  36. 36.Round 96.51 to one decimal place. =
  37. 37.Round 28.11 to one decimal place. =
  38. 38.Which is closest to 1005 ÷ 19? (a) 50 (b) 25 (c) 500 (d) 100
  39. 39.Which is closest to 703 × 22? (Round each number first.) (a) 140000 (b) 28000 (c) 14000 (d) 1400
  40. 40.Round 51.44 to one decimal place. =

Answer key

  1. 50
  2. 1100
  3. 36000
  4. 36000
  5. 50970
  6. 20000
  7. 1000
  8. 81700
  9. 56000
  10. 30.8
  11. 50
  12. 20
  13. 35000
  14. 40000
  15. 10.1
  16. 40
  17. 25000
  18. 60900
  19. 70
  20. 18.7
  21. 2000
  22. 1200
  23. 80
  24. 75100
  25. 1000
  26. 59440
  27. 1600
  28. 800
  29. 700
  30. 50
  31. 69.9
  32. 21000
  33. 51000
  34. 38.9
  35. 97710
  36. 96.5
  37. 28.1
  38. 50
  39. 14000
  40. 51.4

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