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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 726 · 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 36602 to the nearest ten.
  2. 2.Which is closest to 897 + 503 + 396? (a) 1800 (b) 1700 (c) 1900 (d) 2000
  3. 3.Which is closest to 504 + 896 + 805? (a) 2400 (b) 2200 (c) 2300 (d) 2100
  4. 4.Round 43.91 to one decimal place. =
  5. 5.Which is closest to 696 × 88? (Round each number first.) (a) 63000 (b) 630000 (c) 6300 (d) 126000
  6. 6.Which is closest to 696 × 38? (Round each number first.) (a) 56000 (b) 280000 (c) 2800 (d) 28000
  7. 7.Which is closest to 196 + 195 + 697? (a) 1200 (b) 1000 (c) 1100 (d) 1300
  8. 8.Which is closest to 302 × 32? (Round each number first.) (a) 9000 (b) 90000 (c) 18000 (d) 900
  9. 9.Which is closest to 495 + 604 + 203? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  10. 10.Which is closest to 4003 ÷ 49? (a) 80 (b) 160 (c) 800 (d) 40
  11. 11.Round 60829 to the nearest ten.
  12. 12.Which is closest to 898 × 28? (Round each number first.) (a) 270000 (b) 27000 (c) 2700 (d) 54000
  13. 13.Which is closest to 196 × 61? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000
  14. 14.Which is closest to 201 + 305 + 299? (a) 700 (b) 1000 (c) 800 (d) 900
  15. 15.Which is closest to 906 ÷ 29? (a) 60 (b) 300 (c) 15 (d) 30
  16. 16.Which is closest to 796 × 79? (Round each number first.) (a) 128000 (b) 640000 (c) 6400 (d) 64000
  17. 17.Which is closest to 1491 ÷ 49? (a) 60 (b) 30 (c) 300 (d) 15
  18. 18.Which is closest to 503 × 21? (Round each number first.) (a) 20000 (b) 100000 (c) 1000 (d) 10000
  19. 19.Which is closest to 1193 ÷ 19? (a) 30 (b) 120 (c) 60 (d) 600
  20. 20.Round 86854 to the nearest thousand.
  21. 21.Which is closest to 703 + 195 + 304? (a) 1100 (b) 1200 (c) 1400 (d) 1300
  22. 22.Which is closest to 598 + 404 + 802? (a) 2000 (b) 1700 (c) 1800 (d) 1900
  23. 23.Which is closest to 496 × 28? (Round each number first.) (a) 150000 (b) 1500 (c) 15000 (d) 30000
  24. 24.Which is closest to 1508 ÷ 29? (a) 50 (b) 500 (c) 100 (d) 25
  25. 25.Which is closest to 1804 ÷ 31? (a) 30 (b) 600 (c) 60 (d) 120
  26. 26.Round 37251 to the nearest thousand.
  27. 27.Which is closest to 199 × 41? (Round each number first.) (a) 80000 (b) 16000 (c) 800 (d) 8000
  28. 28.Which is closest to 601 × 51? (Round each number first.) (a) 30000 (b) 60000 (c) 300000 (d) 3000
  29. 29.Round 98.48 to one decimal place. =
  30. 30.Round 30.61 to one decimal place. =
  31. 31.Which is closest to 2407 ÷ 39? (a) 600 (b) 120 (c) 60 (d) 30
  32. 32.Round 36.59 to one decimal place. =
  33. 33.Which is closest to 201 + 799 + 503? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  34. 34.Round 30.27 to one decimal place. =
  35. 35.Round 68.51 to one decimal place. =
  36. 36.Which is closest to 297 + 100 + 497? (a) 800 (b) 900 (c) 1100 (d) 1000
  37. 37.Round 49.88 to one decimal place. =
  38. 38.Which is closest to 696 × 69? (Round each number first.) (a) 490000 (b) 4900 (c) 98000 (d) 49000
  39. 39.Which is closest to 397 + 102 + 402? (a) 800 (b) 900 (c) 1000 (d) 1100
  40. 40.Round 84.18 to one decimal place. =

Answer key

  1. 36600
  2. 1800
  3. 2200
  4. 43.9
  5. 63000
  6. 28000
  7. 1100
  8. 9000
  9. 1300
  10. 80
  11. 60830
  12. 27000
  13. 12000
  14. 800
  15. 30
  16. 64000
  17. 30
  18. 10000
  19. 60
  20. 87000
  21. 1200
  22. 1800
  23. 15000
  24. 50
  25. 60
  26. 37000
  27. 8000
  28. 30000
  29. 98.5
  30. 30.6
  31. 60
  32. 36.6
  33. 1500
  34. 30.3
  35. 68.5
  36. 900
  37. 49.9
  38. 49000
  39. 900
  40. 84.2

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