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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 250 · 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 601 + 598 + 403? (a) 1600 (b) 1800 (c) 1700 (d) 1500
  2. 2.Which is closest to 701 + 196 + 298? (a) 1200 (b) 1300 (c) 1100 (d) 1400
  3. 3.Which is closest to 2791 ÷ 39? (a) 70 (b) 700 (c) 35 (d) 140
  4. 4.Which is closest to 797 × 39? (Round each number first.) (a) 320000 (b) 3200 (c) 64000 (d) 32000
  5. 5.Round 56888 to the nearest hundred.
  6. 6.Which is closest to 796 × 41? (Round each number first.) (a) 32000 (b) 3200 (c) 320000 (d) 64000
  7. 7.Round 46.67 to one decimal place. =
  8. 8.Round 34.93 to one decimal place. =
  9. 9.Which is closest to 798 × 71? (Round each number first.) (a) 560000 (b) 112000 (c) 5600 (d) 56000
  10. 10.Which is closest to 296 × 40? (Round each number first.) (a) 12000 (b) 24000 (c) 120000 (d) 1200
  11. 11.Which is closest to 1203 ÷ 19? (a) 600 (b) 30 (c) 60 (d) 120
  12. 12.Round 70054 to the nearest hundred.
  13. 13.Round 19.61 to one decimal place. =
  14. 14.Which is closest to 400 + 100 + 105? (a) 700 (b) 600 (c) 800 (d) 500
  15. 15.Round 93.59 to one decimal place. =
  16. 16.Which is closest to 204 × 22? (Round each number first.) (a) 40000 (b) 8000 (c) 400 (d) 4000
  17. 17.Round 7241 to the nearest thousand.
  18. 18.Which is closest to 1400 ÷ 21? (a) 35 (b) 700 (c) 140 (d) 70
  19. 19.Which is closest to 404 + 297 + 203? (a) 900 (b) 1000 (c) 1100 (d) 800
  20. 20.Round 92.36 to one decimal place. =
  21. 21.Which is closest to 1002 ÷ 19? (a) 100 (b) 25 (c) 500 (d) 50
  22. 22.Which is closest to 897 + 103 + 299? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  23. 23.Which is closest to 799 + 703 + 399? (a) 2000 (b) 1800 (c) 1900 (d) 2100
  24. 24.Round 67673 to the nearest hundred.
  25. 25.Which is closest to 802 × 51? (Round each number first.) (a) 400000 (b) 4000 (c) 40000 (d) 80000
  26. 26.Which is closest to 202 × 19? (Round each number first.) (a) 40000 (b) 400 (c) 8000 (d) 4000
  27. 27.Which is closest to 1198 ÷ 39? (a) 300 (b) 60 (c) 15 (d) 30
  28. 28.Which is closest to 901 + 699 + 404? (a) 2100 (b) 1900 (c) 2200 (d) 2000
  29. 29.Which is closest to 1196 ÷ 19? (a) 120 (b) 600 (c) 30 (d) 60
  30. 30.Round 23728 to the nearest thousand.
  31. 31.Which is closest to 201 × 80? (Round each number first.) (a) 32000 (b) 160000 (c) 16000 (d) 1600
  32. 32.Which is closest to 697 × 60? (Round each number first.) (a) 420000 (b) 4200 (c) 84000 (d) 42000
  33. 33.Round 78.86 to one decimal place. =
  34. 34.Which is closest to 202 × 79? (Round each number first.) (a) 1600 (b) 160000 (c) 32000 (d) 16000
  35. 35.Which is closest to 497 × 79? (Round each number first.) (a) 400000 (b) 4000 (c) 80000 (d) 40000
  36. 36.Which is closest to 991 ÷ 21? (a) 100 (b) 50 (c) 25 (d) 500
  37. 37.Which is closest to 298 × 20? (Round each number first.) (a) 6000 (b) 60000 (c) 600 (d) 12000
  38. 38.Round 33025 to the nearest thousand.
  39. 39.Round 48.27 to one decimal place. =
  40. 40.Round 73.21 to one decimal place. =

Answer key

  1. 1600
  2. 1200
  3. 70
  4. 32000
  5. 56900
  6. 32000
  7. 46.7
  8. 34.9
  9. 56000
  10. 12000
  11. 60
  12. 70100
  13. 19.6
  14. 600
  15. 93.6
  16. 4000
  17. 7000
  18. 70
  19. 900
  20. 92.4
  21. 50
  22. 1300
  23. 1900
  24. 67700
  25. 40000
  26. 4000
  27. 30
  28. 2000
  29. 60
  30. 24000
  31. 16000
  32. 42000
  33. 78.9
  34. 16000
  35. 40000
  36. 50
  37. 6000
  38. 33000
  39. 48.3
  40. 73.2

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