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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 642 · 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 2399 ÷ 29? (a) 800 (b) 80 (c) 160 (d) 40
  2. 2.Which is closest to 4497 ÷ 49? (a) 90 (b) 45 (c) 180 (d) 900
  3. 3.Which is closest to 897 + 495 + 702? (a) 2300 (b) 2100 (c) 2200 (d) 2000
  4. 4.Round 33669 to the nearest hundred.
  5. 5.Which is closest to 900 + 795 + 196? (a) 1900 (b) 1800 (c) 2100 (d) 2000
  6. 6.Which is closest to 1499 ÷ 31? (a) 500 (b) 50 (c) 100 (d) 25
  7. 7.Which is closest to 803 + 204 + 703? (a) 1700 (b) 1800 (c) 1900 (d) 1600
  8. 8.Round 13.86 to one decimal place. =
  9. 9.Which is closest to 900 × 88? (Round each number first.) (a) 8100 (b) 162000 (c) 81000 (d) 810000
  10. 10.Which is closest to 104 + 202 + 199? (a) 400 (b) 500 (c) 600 (d) 700
  11. 11.Which is closest to 97 + 395 + 502? (a) 1200 (b) 1100 (c) 900 (d) 1000
  12. 12.Round 41.76 to one decimal place. =
  13. 13.Which is closest to 202 + 503 + 200? (a) 800 (b) 1000 (c) 1100 (d) 900
  14. 14.Which is closest to 994 ÷ 19? (a) 50 (b) 100 (c) 500 (d) 25
  15. 15.Round 29.94 to one decimal place. =
  16. 16.Round 10.51 to one decimal place. =
  17. 17.Which is closest to 405 + 497 + 505? (a) 1300 (b) 1500 (c) 1400 (d) 1600
  18. 18.Round 52.27 to one decimal place. =
  19. 19.Which is closest to 805 + 696 + 397? (a) 1900 (b) 2100 (c) 1800 (d) 2000
  20. 20.Which is closest to 297 × 49? (Round each number first.) (a) 150000 (b) 15000 (c) 30000 (d) 1500
  21. 21.Round 26359 to the nearest hundred.
  22. 22.Which is closest to 397 + 698 + 698? (a) 2000 (b) 1900 (c) 1800 (d) 1700
  23. 23.Which is closest to 4495 ÷ 49? (a) 180 (b) 90 (c) 45 (d) 900
  24. 24.Which is closest to 804 × 79? (Round each number first.) (a) 128000 (b) 64000 (c) 6400 (d) 640000
  25. 25.Which is closest to 798 + 796 + 396? (a) 2000 (b) 2200 (c) 1900 (d) 2100
  26. 26.Which is closest to 396 + 500 + 905? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  27. 27.Round 73.69 to one decimal place. =
  28. 28.Round 69468 to the nearest hundred.
  29. 29.Which is closest to 499 × 39? (Round each number first.) (a) 20000 (b) 40000 (c) 200000 (d) 2000
  30. 30.Which is closest to 298 + 299 + 403? (a) 1000 (b) 1200 (c) 1100 (d) 900
  31. 31.Round 27.79 to one decimal place. =
  32. 32.Which is closest to 899 × 28? (Round each number first.) (a) 27000 (b) 2700 (c) 270000 (d) 54000
  33. 33.Round 5687 to the nearest ten.
  34. 34.Which is closest to 595 ÷ 21? (a) 60 (b) 300 (c) 30 (d) 15
  35. 35.Which is closest to 398 ÷ 19? (a) 200 (b) 20 (c) 10 (d) 40
  36. 36.Which is closest to 96 + 801 + 796? (a) 1900 (b) 1700 (c) 1800 (d) 1600
  37. 37.Round 90426 to the nearest ten.
  38. 38.Which is closest to 603 × 21? (Round each number first.) (a) 24000 (b) 12000 (c) 120000 (d) 1200
  39. 39.Round 91512 to the nearest ten.
  40. 40.Which is closest to 697 × 38? (Round each number first.) (a) 2800 (b) 56000 (c) 28000 (d) 280000

Answer key

  1. 80
  2. 90
  3. 2100
  4. 33700
  5. 1900
  6. 50
  7. 1700
  8. 13.9
  9. 81000
  10. 500
  11. 1000
  12. 41.8
  13. 900
  14. 50
  15. 29.9
  16. 10.5
  17. 1400
  18. 52.3
  19. 1900
  20. 15000
  21. 26400
  22. 1800
  23. 90
  24. 64000
  25. 2000
  26. 1800
  27. 73.7
  28. 69500
  29. 20000
  30. 1000
  31. 27.8
  32. 27000
  33. 5690
  34. 30
  35. 20
  36. 1700
  37. 90430
  38. 12000
  39. 91510
  40. 28000

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