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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 932 · 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 99 + 195 + 195? (a) 600 (b) 400 (c) 700 (d) 500
  2. 2.Round 10.36 to one decimal place. =
  3. 3.Which is closest to 4509 ÷ 51? (a) 180 (b) 90 (c) 900 (d) 45
  4. 4.Round 52.11 to one decimal place. =
  5. 5.Round 46.16 to one decimal place. =
  6. 6.Which is closest to 904 × 69? (Round each number first.) (a) 126000 (b) 63000 (c) 630000 (d) 6300
  7. 7.Which is closest to 498 + 504 + 398? (a) 1600 (b) 1500 (c) 1300 (d) 1400
  8. 8.Which is closest to 299 × 51? (Round each number first.) (a) 15000 (b) 30000 (c) 1500 (d) 150000
  9. 9.Which is closest to 199 × 21? (Round each number first.) (a) 8000 (b) 40000 (c) 4000 (d) 400
  10. 10.Which is closest to 1206 ÷ 31? (a) 400 (b) 80 (c) 20 (d) 40
  11. 11.Which is closest to 303 + 599 + 197? (a) 1300 (b) 1000 (c) 1100 (d) 1200
  12. 12.Which is closest to 2708 ÷ 31? (a) 180 (b) 45 (c) 900 (d) 90
  13. 13.Which is closest to 296 + 897 + 304? (a) 1400 (b) 1600 (c) 1500 (d) 1700
  14. 14.Which is closest to 2801 ÷ 41? (a) 700 (b) 140 (c) 70 (d) 35
  15. 15.Round 62.68 to one decimal place. =
  16. 16.Which is closest to 809 ÷ 41? (a) 10 (b) 20 (c) 200 (d) 40
  17. 17.Which is closest to 303 + 195 + 595? (a) 1000 (b) 1100 (c) 1200 (d) 1300
  18. 18.Which is closest to 697 × 38? (Round each number first.) (a) 28000 (b) 2800 (c) 56000 (d) 280000
  19. 19.Round 22604 to the nearest ten.
  20. 20.Which is closest to 798 × 88? (Round each number first.) (a) 72000 (b) 7200 (c) 720000 (d) 144000
  21. 21.Round 20068 to the nearest ten.
  22. 22.Which is closest to 799 × 79? (Round each number first.) (a) 640000 (b) 64000 (c) 6400 (d) 128000
  23. 23.Round 77.58 to one decimal place. =
  24. 24.Round 92.26 to one decimal place. =
  25. 25.Which is closest to 999 ÷ 21? (a) 500 (b) 100 (c) 50 (d) 25
  26. 26.Which is closest to 302 × 92? (Round each number first.) (a) 270000 (b) 2700 (c) 54000 (d) 27000
  27. 27.Round 90.19 to one decimal place. =
  28. 28.Round 69648 to the nearest ten.
  29. 29.Which is closest to 204 + 900 + 495? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  30. 30.Which is closest to 402 + 102 + 900? (a) 1600 (b) 1500 (c) 1400 (d) 1300
  31. 31.Which is closest to 304 × 19? (Round each number first.) (a) 12000 (b) 6000 (c) 600 (d) 60000
  32. 32.Which is closest to 500 × 32? (Round each number first.) (a) 150000 (b) 30000 (c) 15000 (d) 1500
  33. 33.Round 92.17 to one decimal place. =
  34. 34.Round 68.26 to one decimal place. =
  35. 35.Which is closest to 704 × 81? (Round each number first.) (a) 112000 (b) 5600 (c) 560000 (d) 56000
  36. 36.Which is closest to 2098 ÷ 31? (a) 700 (b) 70 (c) 35 (d) 140
  37. 37.Round 45466 to the nearest thousand.
  38. 38.Which is closest to 4004 ÷ 51? (a) 800 (b) 160 (c) 40 (d) 80
  39. 39.Which is closest to 2796 ÷ 39? (a) 35 (b) 70 (c) 140 (d) 700
  40. 40.Which is closest to 898 × 30? (Round each number first.) (a) 27000 (b) 270000 (c) 54000 (d) 2700

Answer key

  1. 500
  2. 10.4
  3. 90
  4. 52.1
  5. 46.2
  6. 63000
  7. 1400
  8. 15000
  9. 4000
  10. 40
  11. 1100
  12. 90
  13. 1500
  14. 70
  15. 62.7
  16. 20
  17. 1100
  18. 28000
  19. 22600
  20. 72000
  21. 20070
  22. 64000
  23. 77.6
  24. 92.3
  25. 50
  26. 27000
  27. 90.2
  28. 69650
  29. 1600
  30. 1400
  31. 6000
  32. 15000
  33. 92.2
  34. 68.3
  35. 56000
  36. 70
  37. 45000
  38. 80
  39. 70
  40. 27000

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