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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 256 · 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 100 + 797 + 295? (a) 1400 (b) 1100 (c) 1300 (d) 1200
  2. 2.Which is closest to 904 + 504 + 496? (a) 1800 (b) 2000 (c) 2100 (d) 1900
  3. 3.Round 75384 to the nearest hundred.
  4. 4.Which is closest to 896 × 91? (Round each number first.) (a) 162000 (b) 8100 (c) 81000 (d) 810000
  5. 5.Which is closest to 499 + 197 + 804? (a) 1400 (b) 1600 (c) 1500 (d) 1700
  6. 6.Which is closest to 103 + 95 + 702? (a) 800 (b) 1000 (c) 900 (d) 1100
  7. 7.Which is closest to 1597 ÷ 41? (a) 80 (b) 40 (c) 20 (d) 400
  8. 8.Round 60.18 to one decimal place. =
  9. 9.Round 66.26 to one decimal place. =
  10. 10.Which is closest to 897 + 298 + 199? (a) 1500 (b) 1400 (c) 1300 (d) 1600
  11. 11.Round 12436 to the nearest hundred.
  12. 12.Round 7533 to the nearest hundred.
  13. 13.Which is closest to 698 + 703 + 201? (a) 1500 (b) 1700 (c) 1600 (d) 1800
  14. 14.Round 37.89 to one decimal place. =
  15. 15.Which is closest to 498 × 71? (Round each number first.) (a) 3500 (b) 70000 (c) 35000 (d) 350000
  16. 16.Which is closest to 1497 ÷ 51? (a) 30 (b) 300 (c) 60 (d) 15
  17. 17.Which is closest to 2007 ÷ 49? (a) 400 (b) 20 (c) 80 (d) 40
  18. 18.Which is closest to 698 + 397 + 103? (a) 1300 (b) 1400 (c) 1200 (d) 1100
  19. 19.Round 63987 to the nearest hundred.
  20. 20.Which is closest to 197 + 503 + 698? (a) 1500 (b) 1300 (c) 1600 (d) 1400
  21. 21.Which is closest to 901 × 29? (Round each number first.) (a) 270000 (b) 2700 (c) 27000 (d) 54000
  22. 22.Which is closest to 401 × 20? (Round each number first.) (a) 80000 (b) 800 (c) 16000 (d) 8000
  23. 23.Round 26.23 to one decimal place. =
  24. 24.Which is closest to 301 + 199 + 595? (a) 1100 (b) 1300 (c) 1000 (d) 1200
  25. 25.Which is closest to 804 + 803 + 99? (a) 1600 (b) 1700 (c) 1900 (d) 1800
  26. 26.Which is closest to 1597 ÷ 39? (a) 20 (b) 400 (c) 40 (d) 80
  27. 27.Which is closest to 1193 ÷ 41? (a) 30 (b) 300 (c) 60 (d) 15
  28. 28.Which is closest to 397 × 18? (Round each number first.) (a) 8000 (b) 800 (c) 80000 (d) 16000
  29. 29.Which is closest to 1199 ÷ 31? (a) 80 (b) 40 (c) 20 (d) 400
  30. 30.Round 17191 to the nearest hundred.
  31. 31.Which is closest to 599 × 79? (Round each number first.) (a) 480000 (b) 48000 (c) 4800 (d) 96000
  32. 32.Which is closest to 301 × 71? (Round each number first.) (a) 42000 (b) 2100 (c) 21000 (d) 210000
  33. 33.Round 67712 to the nearest thousand.
  34. 34.Which is closest to 801 ÷ 19? (a) 400 (b) 40 (c) 20 (d) 80
  35. 35.Round 78.94 to one decimal place. =
  36. 36.Which is closest to 1809 ÷ 29? (a) 600 (b) 120 (c) 60 (d) 30
  37. 37.Which is closest to 699 × 68? (Round each number first.) (a) 98000 (b) 490000 (c) 49000 (d) 4900
  38. 38.Which is closest to 796 + 595 + 199? (a) 1600 (b) 1500 (c) 1700 (d) 1800
  39. 39.Round 65.11 to one decimal place. =
  40. 40.Which is closest to 1603 ÷ 41? (a) 80 (b) 40 (c) 20 (d) 400

Answer key

  1. 1200
  2. 1900
  3. 75400
  4. 81000
  5. 1500
  6. 900
  7. 40
  8. 60.2
  9. 66.3
  10. 1400
  11. 12400
  12. 7500
  13. 1600
  14. 37.9
  15. 35000
  16. 30
  17. 40
  18. 1200
  19. 64000
  20. 1400
  21. 27000
  22. 8000
  23. 26.2
  24. 1100
  25. 1700
  26. 40
  27. 30
  28. 8000
  29. 40
  30. 17200
  31. 48000
  32. 21000
  33. 68000
  34. 40
  35. 78.9
  36. 60
  37. 49000
  38. 1600
  39. 65.1
  40. 40

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