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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 696 · 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 48587 to the nearest thousand.
  2. 2.Which is closest to 197 × 62? (Round each number first.) (a) 12000 (b) 24000 (c) 1200 (d) 120000
  3. 3.Which is closest to 695 + 95 + 401? (a) 1100 (b) 1300 (c) 1400 (d) 1200
  4. 4.Which is closest to 1208 ÷ 29? (a) 400 (b) 20 (c) 80 (d) 40
  5. 5.Round 38167 to the nearest ten.
  6. 6.Round 12.87 to one decimal place. =
  7. 7.Round 39508 to the nearest hundred.
  8. 8.Which is closest to 2395 ÷ 29? (a) 40 (b) 800 (c) 160 (d) 80
  9. 9.Which is closest to 705 + 898 + 301? (a) 2100 (b) 2000 (c) 1800 (d) 1900
  10. 10.Round 48.21 to one decimal place. =
  11. 11.Which is closest to 499 × 69? (Round each number first.) (a) 350000 (b) 70000 (c) 3500 (d) 35000
  12. 12.Round 16148 to the nearest thousand.
  13. 13.Round 10349 to the nearest hundred.
  14. 14.Round 46.74 to one decimal place. =
  15. 15.Which is closest to 1798 ÷ 19? (a) 180 (b) 45 (c) 90 (d) 900
  16. 16.Which is closest to 404 × 90? (Round each number first.) (a) 3600 (b) 360000 (c) 72000 (d) 36000
  17. 17.Which is closest to 302 × 19? (Round each number first.) (a) 600 (b) 60000 (c) 6000 (d) 12000
  18. 18.Which is closest to 993 ÷ 19? (a) 500 (b) 25 (c) 50 (d) 100
  19. 19.Round 33.18 to one decimal place. =
  20. 20.Round 87029 to the nearest thousand.
  21. 21.Which is closest to 295 + 195 + 304? (a) 700 (b) 1000 (c) 900 (d) 800
  22. 22.Round 83.63 to one decimal place. =
  23. 23.Which is closest to 796 × 82? (Round each number first.) (a) 6400 (b) 640000 (c) 64000 (d) 128000
  24. 24.Round 27.36 to one decimal place. =
  25. 25.Which is closest to 500 + 397 + 700? (a) 1700 (b) 1500 (c) 1600 (d) 1800
  26. 26.Which is closest to 401 × 59? (Round each number first.) (a) 2400 (b) 24000 (c) 48000 (d) 240000
  27. 27.Which is closest to 103 + 203 + 198? (a) 700 (b) 600 (c) 500 (d) 400
  28. 28.Which is closest to 401 × 82? (Round each number first.) (a) 3200 (b) 32000 (c) 64000 (d) 320000
  29. 29.Round 2286 to the nearest hundred.
  30. 30.Which is closest to 201 × 20? (Round each number first.) (a) 40000 (b) 400 (c) 4000 (d) 8000
  31. 31.Which is closest to 602 × 28? (Round each number first.) (a) 36000 (b) 18000 (c) 1800 (d) 180000
  32. 32.Round 94.44 to one decimal place. =
  33. 33.Which is closest to 797 × 49? (Round each number first.) (a) 4000 (b) 400000 (c) 40000 (d) 80000
  34. 34.Which is closest to 604 × 28? (Round each number first.) (a) 18000 (b) 36000 (c) 1800 (d) 180000
  35. 35.Which is closest to 702 × 62? (Round each number first.) (a) 42000 (b) 84000 (c) 4200 (d) 420000
  36. 36.Which is closest to 501 × 78? (Round each number first.) (a) 400000 (b) 4000 (c) 40000 (d) 80000
  37. 37.Which is closest to 299 + 804 + 599? (a) 1700 (b) 1900 (c) 1600 (d) 1800
  38. 38.Round 13.62 to one decimal place. =
  39. 39.Which is closest to 1007 ÷ 19? (a) 500 (b) 50 (c) 25 (d) 100
  40. 40.Round 84.82 to one decimal place. =

Answer key

  1. 49000
  2. 12000
  3. 1200
  4. 40
  5. 38170
  6. 12.9
  7. 39500
  8. 80
  9. 1900
  10. 48.2
  11. 35000
  12. 16000
  13. 10300
  14. 46.7
  15. 90
  16. 36000
  17. 6000
  18. 50
  19. 33.2
  20. 87000
  21. 800
  22. 83.6
  23. 64000
  24. 27.4
  25. 1600
  26. 24000
  27. 500
  28. 32000
  29. 2300
  30. 4000
  31. 18000
  32. 94.4
  33. 40000
  34. 18000
  35. 42000
  36. 40000
  37. 1700
  38. 13.6
  39. 50
  40. 84.8

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