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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 271 · 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 18551 to the nearest ten.
  2. 2.Round 96433 to the nearest ten.
  3. 3.Round 52.74 to one decimal place. =
  4. 4.Which is closest to 397 × 18? (Round each number first.) (a) 8000 (b) 80000 (c) 800 (d) 16000
  5. 5.Which is closest to 201 + 497 + 795? (a) 1700 (b) 1400 (c) 1500 (d) 1600
  6. 6.Round 77.72 to one decimal place. =
  7. 7.Which is closest to 303 × 62? (Round each number first.) (a) 36000 (b) 1800 (c) 18000 (d) 180000
  8. 8.Which is closest to 897 × 19? (Round each number first.) (a) 180000 (b) 1800 (c) 36000 (d) 18000
  9. 9.Which is closest to 698 + 301 + 202? (a) 1100 (b) 1200 (c) 1300 (d) 1400
  10. 10.Which is closest to 800 + 504 + 495? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  11. 11.Which is closest to 301 × 51? (Round each number first.) (a) 30000 (b) 15000 (c) 150000 (d) 1500
  12. 12.Which is closest to 802 + 600 + 504? (a) 2100 (b) 1800 (c) 1900 (d) 2000
  13. 13.Which is closest to 696 + 898 + 405? (a) 2000 (b) 1900 (c) 2100 (d) 2200
  14. 14.Which is closest to 104 + 196 + 298? (a) 500 (b) 600 (c) 800 (d) 700
  15. 15.Which is closest to 596 × 90? (Round each number first.) (a) 108000 (b) 540000 (c) 5400 (d) 54000
  16. 16.Which is closest to 402 × 20? (Round each number first.) (a) 800 (b) 80000 (c) 16000 (d) 8000
  17. 17.Which is closest to 301 × 39? (Round each number first.) (a) 24000 (b) 120000 (c) 12000 (d) 1200
  18. 18.Which is closest to 900 × 79? (Round each number first.) (a) 7200 (b) 720000 (c) 72000 (d) 144000
  19. 19.Which is closest to 1009 ÷ 19? (a) 25 (b) 100 (c) 500 (d) 50
  20. 20.Which is closest to 798 + 405 + 395? (a) 1500 (b) 1600 (c) 1800 (d) 1700
  21. 21.Round 34972 to the nearest thousand.
  22. 22.Round 46.92 to one decimal place. =
  23. 23.Which is closest to 799 × 39? (Round each number first.) (a) 320000 (b) 64000 (c) 3200 (d) 32000
  24. 24.Round 75.33 to one decimal place. =
  25. 25.Round 13.23 to one decimal place. =
  26. 26.Which is closest to 97 + 799 + 101? (a) 900 (b) 1100 (c) 1200 (d) 1000
  27. 27.Round 61.34 to one decimal place. =
  28. 28.Round 38.52 to one decimal place. =
  29. 29.Round 40272 to the nearest hundred.
  30. 30.Which is closest to 801 × 82? (Round each number first.) (a) 128000 (b) 64000 (c) 640000 (d) 6400
  31. 31.Which is closest to 395 + 200 + 802? (a) 1500 (b) 1300 (c) 1600 (d) 1400
  32. 32.Which is closest to 897 × 29? (Round each number first.) (a) 27000 (b) 54000 (c) 2700 (d) 270000
  33. 33.Which is closest to 797 × 29? (Round each number first.) (a) 48000 (b) 2400 (c) 24000 (d) 240000
  34. 34.Which is closest to 992 ÷ 19? (a) 50 (b) 25 (c) 100 (d) 500
  35. 35.Round 56.32 to one decimal place. =
  36. 36.Which is closest to 806 ÷ 21? (a) 80 (b) 400 (c) 40 (d) 20
  37. 37.Round 27133 to the nearest ten.
  38. 38.Which is closest to 96 + 299 + 202? (a) 800 (b) 700 (c) 500 (d) 600
  39. 39.Which is closest to 597 + 201 + 804? (a) 1800 (b) 1700 (c) 1500 (d) 1600
  40. 40.Which is closest to 1009 ÷ 51? (a) 10 (b) 20 (c) 200 (d) 40

Answer key

  1. 18550
  2. 96430
  3. 52.7
  4. 8000
  5. 1500
  6. 77.7
  7. 18000
  8. 18000
  9. 1200
  10. 1800
  11. 15000
  12. 1900
  13. 2000
  14. 600
  15. 54000
  16. 8000
  17. 12000
  18. 72000
  19. 50
  20. 1600
  21. 35000
  22. 46.9
  23. 32000
  24. 75.3
  25. 13.2
  26. 1000
  27. 61.3
  28. 38.5
  29. 40300
  30. 64000
  31. 1400
  32. 27000
  33. 24000
  34. 50
  35. 56.3
  36. 40
  37. 27130
  38. 600
  39. 1600
  40. 20

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