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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 48 · 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 2407 ÷ 41? (a) 60 (b) 30 (c) 120 (d) 600
  2. 2.Which is closest to 303 × 90? (Round each number first.) (a) 27000 (b) 54000 (c) 270000 (d) 2700
  3. 3.Round 9703 to the nearest hundred.
  4. 4.Which is closest to 298 + 801 + 701? (a) 1800 (b) 2000 (c) 1700 (d) 1900
  5. 5.Round 21866 to the nearest thousand.
  6. 6.Which is closest to 897 × 51? (Round each number first.) (a) 45000 (b) 4500 (c) 450000 (d) 90000
  7. 7.Round 2375 to the nearest hundred.
  8. 8.Which is closest to 97 + 395 + 499? (a) 1100 (b) 1000 (c) 1200 (d) 900
  9. 9.Round 99.16 to one decimal place. =
  10. 10.Which is closest to 798 × 38? (Round each number first.) (a) 64000 (b) 32000 (c) 320000 (d) 3200
  11. 11.Which is closest to 302 + 298 + 296? (a) 900 (b) 1000 (c) 1100 (d) 800
  12. 12.Which is closest to 604 + 903 + 297? (a) 1800 (b) 1700 (c) 1900 (d) 2000
  13. 13.Round 89.77 to one decimal place. =
  14. 14.Round 16934 to the nearest ten.
  15. 15.Round 37.44 to one decimal place. =
  16. 16.Which is closest to 605 + 101 + 704? (a) 1500 (b) 1600 (c) 1400 (d) 1300
  17. 17.Which is closest to 398 × 79? (Round each number first.) (a) 32000 (b) 64000 (c) 320000 (d) 3200
  18. 18.Which is closest to 699 × 30? (Round each number first.) (a) 21000 (b) 42000 (c) 210000 (d) 2100
  19. 19.Round 66583 to the nearest ten.
  20. 20.Round 63493 to the nearest thousand.
  21. 21.Which is closest to 900 × 92? (Round each number first.) (a) 8100 (b) 810000 (c) 81000 (d) 162000
  22. 22.Round 80313 to the nearest hundred.
  23. 23.Which is closest to 803 × 90? (Round each number first.) (a) 7200 (b) 720000 (c) 144000 (d) 72000
  24. 24.Round 13.39 to one decimal place. =
  25. 25.Which is closest to 1791 ÷ 29? (a) 120 (b) 60 (c) 600 (d) 30
  26. 26.Which is closest to 1492 ÷ 49? (a) 15 (b) 300 (c) 30 (d) 60
  27. 27.Round 63921 to the nearest ten.
  28. 28.Which is closest to 402 + 202 + 102? (a) 900 (b) 700 (c) 800 (d) 600
  29. 29.Which is closest to 396 ÷ 21? (a) 20 (b) 40 (c) 10 (d) 200
  30. 30.Which is closest to 798 + 898 + 496? (a) 2400 (b) 2200 (c) 2100 (d) 2300
  31. 31.Which is closest to 404 × 79? (Round each number first.) (a) 64000 (b) 3200 (c) 320000 (d) 32000
  32. 32.Which is closest to 202 × 32? (Round each number first.) (a) 600 (b) 60000 (c) 6000 (d) 12000
  33. 33.Which is closest to 704 × 18? (Round each number first.) (a) 28000 (b) 1400 (c) 14000 (d) 140000
  34. 34.Round 96.17 to one decimal place. =
  35. 35.Round 98109 to the nearest ten.
  36. 36.Round 95.74 to one decimal place. =
  37. 37.Which is closest to 2105 ÷ 29? (a) 700 (b) 35 (c) 140 (d) 70
  38. 38.Round 97269 to the nearest thousand.
  39. 39.Round 32428 to the nearest ten.
  40. 40.Which is closest to 496 + 701 + 399? (a) 1800 (b) 1600 (c) 1500 (d) 1700

Answer key

  1. 60
  2. 27000
  3. 9700
  4. 1800
  5. 22000
  6. 45000
  7. 2400
  8. 1000
  9. 99.2
  10. 32000
  11. 900
  12. 1800
  13. 89.8
  14. 16930
  15. 37.4
  16. 1400
  17. 32000
  18. 21000
  19. 66580
  20. 63000
  21. 81000
  22. 80300
  23. 72000
  24. 13.4
  25. 60
  26. 30
  27. 63920
  28. 700
  29. 20
  30. 2200
  31. 32000
  32. 6000
  33. 14000
  34. 96.2
  35. 98110
  36. 95.7
  37. 70
  38. 97000
  39. 32430
  40. 1600

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