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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 689 · 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 297 × 60? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
  2. 2.Round 46.09 to one decimal place. =
  3. 3.Round 8982 to the nearest thousand.
  4. 4.Round 20.44 to one decimal place. =
  5. 5.Which is closest to 802 + 303 + 796? (a) 1800 (b) 2000 (c) 2100 (d) 1900
  6. 6.Which is closest to 201 × 41? (Round each number first.) (a) 8000 (b) 800 (c) 80000 (d) 16000
  7. 7.Which is closest to 899 + 101 + 803? (a) 1700 (b) 1900 (c) 2000 (d) 1800
  8. 8.Which is closest to 296 × 31? (Round each number first.) (a) 18000 (b) 900 (c) 90000 (d) 9000
  9. 9.Which is closest to 602 × 70? (Round each number first.) (a) 84000 (b) 42000 (c) 420000 (d) 4200
  10. 10.Which is closest to 2396 ÷ 29? (a) 800 (b) 80 (c) 40 (d) 160
  11. 11.Round 57348 to the nearest ten.
  12. 12.Which is closest to 899 × 71? (Round each number first.) (a) 126000 (b) 63000 (c) 6300 (d) 630000
  13. 13.Which is closest to 900 × 92? (Round each number first.) (a) 162000 (b) 8100 (c) 810000 (d) 81000
  14. 14.Round 50403 to the nearest hundred.
  15. 15.Round 97281 to the nearest ten.
  16. 16.Which is closest to 299 + 903 + 501? (a) 1900 (b) 1800 (c) 1600 (d) 1700
  17. 17.Round 15226 to the nearest ten.
  18. 18.Round 91172 to the nearest thousand.
  19. 19.Which is closest to 404 × 91? (Round each number first.) (a) 36000 (b) 360000 (c) 3600 (d) 72000
  20. 20.Round 49245 to the nearest hundred.
  21. 21.Which is closest to 1192 ÷ 21? (a) 30 (b) 120 (c) 600 (d) 60
  22. 22.Which is closest to 298 + 401 + 399? (a) 1200 (b) 1300 (c) 1100 (d) 1000
  23. 23.Round 76257 to the nearest hundred.
  24. 24.Round 36.66 to one decimal place. =
  25. 25.Which is closest to 1199 ÷ 31? (a) 20 (b) 400 (c) 40 (d) 80
  26. 26.Round 20.54 to one decimal place. =
  27. 27.Round 70.63 to one decimal place. =
  28. 28.Which is closest to 301 × 89? (Round each number first.) (a) 270000 (b) 2700 (c) 27000 (d) 54000
  29. 29.Which is closest to 698 × 20? (Round each number first.) (a) 1400 (b) 28000 (c) 14000 (d) 140000
  30. 30.Which is closest to 698 × 38? (Round each number first.) (a) 28000 (b) 280000 (c) 56000 (d) 2800
  31. 31.Which is closest to 797 + 300 + 305? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  32. 32.Round 61.69 to one decimal place. =
  33. 33.Which is closest to 1392 ÷ 21? (a) 35 (b) 140 (c) 700 (d) 70
  34. 34.Which is closest to 994 ÷ 51? (a) 200 (b) 40 (c) 10 (d) 20
  35. 35.Round 12082 to the nearest hundred.
  36. 36.Round 36626 to the nearest ten.
  37. 37.Which is closest to 1009 ÷ 19? (a) 100 (b) 500 (c) 25 (d) 50
  38. 38.Which is closest to 501 × 32? (Round each number first.) (a) 15000 (b) 30000 (c) 150000 (d) 1500
  39. 39.Round 18.41 to one decimal place. =
  40. 40.Round 57524 to the nearest hundred.

Answer key

  1. 18000
  2. 46.1
  3. 9000
  4. 20.4
  5. 1900
  6. 8000
  7. 1800
  8. 9000
  9. 42000
  10. 80
  11. 57350
  12. 63000
  13. 81000
  14. 50400
  15. 97280
  16. 1700
  17. 15230
  18. 91000
  19. 36000
  20. 49200
  21. 60
  22. 1100
  23. 76300
  24. 36.7
  25. 40
  26. 20.5
  27. 70.6
  28. 27000
  29. 14000
  30. 28000
  31. 1400
  32. 61.7
  33. 70
  34. 20
  35. 12100
  36. 36630
  37. 50
  38. 15000
  39. 18.4
  40. 57500

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