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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 640 · 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 2698 ÷ 31? (a) 900 (b) 180 (c) 90 (d) 45
  2. 2.Which is closest to 898 + 697 + 498? (a) 2200 (b) 2300 (c) 2000 (d) 2100
  3. 3.Which is closest to 501 + 804 + 895? (a) 2100 (b) 2300 (c) 2200 (d) 2400
  4. 4.Which is closest to 298 × 49? (Round each number first.) (a) 15000 (b) 1500 (c) 30000 (d) 150000
  5. 5.Which is closest to 701 × 92? (Round each number first.) (a) 63000 (b) 630000 (c) 126000 (d) 6300
  6. 6.Which is closest to 895 + 705 + 499? (a) 2000 (b) 2200 (c) 2300 (d) 2100
  7. 7.Which is closest to 504 × 51? (Round each number first.) (a) 250000 (b) 2500 (c) 50000 (d) 25000
  8. 8.Which is closest to 899 + 197 + 799? (a) 2000 (b) 2100 (c) 1800 (d) 1900
  9. 9.Round 98104 to the nearest hundred.
  10. 10.Which is closest to 99 + 299 + 204? (a) 800 (b) 500 (c) 600 (d) 700
  11. 11.Which is closest to 904 + 105 + 597? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  12. 12.Which is closest to 699 × 21? (Round each number first.) (a) 28000 (b) 140000 (c) 1400 (d) 14000
  13. 13.Round 64.18 to one decimal place. =
  14. 14.Which is closest to 2406 ÷ 29? (a) 40 (b) 800 (c) 160 (d) 80
  15. 15.Which is closest to 991 ÷ 19? (a) 500 (b) 25 (c) 100 (d) 50
  16. 16.Which is closest to 497 × 62? (Round each number first.) (a) 3000 (b) 60000 (c) 30000 (d) 300000
  17. 17.Which is closest to 597 × 80? (Round each number first.) (a) 96000 (b) 48000 (c) 4800 (d) 480000
  18. 18.Which is closest to 197 × 70? (Round each number first.) (a) 1400 (b) 140000 (c) 14000 (d) 28000
  19. 19.Round 52978 to the nearest hundred.
  20. 20.Round 14.79 to one decimal place. =
  21. 21.Round 13.22 to one decimal place. =
  22. 22.Round 10388 to the nearest ten.
  23. 23.Which is closest to 1506 ÷ 49? (a) 300 (b) 15 (c) 30 (d) 60
  24. 24.Which is closest to 295 + 702 + 696? (a) 1600 (b) 1700 (c) 1800 (d) 1900
  25. 25.Which is closest to 800 + 895 + 703? (a) 2300 (b) 2400 (c) 2500 (d) 2600
  26. 26.Round 73945 to the nearest thousand.
  27. 27.Round 97879 to the nearest ten.
  28. 28.Round 27951 to the nearest ten.
  29. 29.Which is closest to 301 × 49? (Round each number first.) (a) 1500 (b) 150000 (c) 15000 (d) 30000
  30. 30.Round 46.23 to one decimal place. =
  31. 31.Which is closest to 602 + 601 + 396? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  32. 32.Which is closest to 698 × 29? (Round each number first.) (a) 42000 (b) 2100 (c) 21000 (d) 210000
  33. 33.Which is closest to 702 × 39? (Round each number first.) (a) 280000 (b) 2800 (c) 28000 (d) 56000
  34. 34.Which is closest to 395 + 399 + 699? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  35. 35.Which is closest to 499 × 81? (Round each number first.) (a) 40000 (b) 80000 (c) 400000 (d) 4000
  36. 36.Round 49.66 to one decimal place. =
  37. 37.Which is closest to 804 × 59? (Round each number first.) (a) 480000 (b) 4800 (c) 48000 (d) 96000
  38. 38.Round 45381 to the nearest ten.
  39. 39.Round 34.89 to one decimal place. =
  40. 40.Round 88.62 to one decimal place. =

Answer key

  1. 90
  2. 2100
  3. 2200
  4. 15000
  5. 63000
  6. 2100
  7. 25000
  8. 1900
  9. 98100
  10. 600
  11. 1600
  12. 14000
  13. 64.2
  14. 80
  15. 50
  16. 30000
  17. 48000
  18. 14000
  19. 53000
  20. 14.8
  21. 13.2
  22. 10390
  23. 30
  24. 1700
  25. 2400
  26. 74000
  27. 97880
  28. 27950
  29. 15000
  30. 46.2
  31. 1600
  32. 21000
  33. 28000
  34. 1500
  35. 40000
  36. 49.7
  37. 48000
  38. 45380
  39. 34.9
  40. 88.6

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