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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 641 · 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 97.51 to one decimal place. =
  2. 2.Which is closest to 698 + 797 + 402? (a) 2100 (b) 1900 (c) 1800 (d) 2000
  3. 3.Which is closest to 296 + 595 + 797? (a) 1600 (b) 1900 (c) 1800 (d) 1700
  4. 4.Which is closest to 402 + 398 + 798? (a) 1800 (b) 1500 (c) 1700 (d) 1600
  5. 5.Round 99.73 to one decimal place. =
  6. 6.Which is closest to 3195 ÷ 39? (a) 160 (b) 800 (c) 80 (d) 40
  7. 7.Which is closest to 100 + 604 + 903? (a) 1500 (b) 1700 (c) 1800 (d) 1600
  8. 8.Which is closest to 1609 ÷ 19? (a) 40 (b) 800 (c) 160 (d) 80
  9. 9.Which is closest to 195 + 805 + 205? (a) 1100 (b) 1200 (c) 1300 (d) 1400
  10. 10.Which is closest to 305 + 904 + 395? (a) 1600 (b) 1800 (c) 1700 (d) 1500
  11. 11.Which is closest to 404 + 504 + 605? (a) 1500 (b) 1700 (c) 1600 (d) 1400
  12. 12.Round 13.18 to one decimal place. =
  13. 13.Which is closest to 503 × 41? (Round each number first.) (a) 20000 (b) 2000 (c) 200000 (d) 40000
  14. 14.Which is closest to 696 × 70? (Round each number first.) (a) 98000 (b) 49000 (c) 490000 (d) 4900
  15. 15.Round 18.52 to one decimal place. =
  16. 16.Which is closest to 903 × 92? (Round each number first.) (a) 810000 (b) 8100 (c) 162000 (d) 81000
  17. 17.Which is closest to 1503 ÷ 31? (a) 50 (b) 25 (c) 100 (d) 500
  18. 18.Which is closest to 96 + 95 + 295? (a) 500 (b) 600 (c) 700 (d) 400
  19. 19.Which is closest to 900 × 41? (Round each number first.) (a) 72000 (b) 360000 (c) 36000 (d) 3600
  20. 20.Which is closest to 1796 ÷ 19? (a) 90 (b) 45 (c) 180 (d) 900
  21. 21.Which is closest to 601 + 804 + 500? (a) 2100 (b) 2000 (c) 1900 (d) 1800
  22. 22.Which is closest to 899 + 302 + 903? (a) 2000 (b) 2300 (c) 2200 (d) 2100
  23. 23.Round 33893 to the nearest thousand.
  24. 24.Round 94206 to the nearest hundred.
  25. 25.Round 30.31 to one decimal place. =
  26. 26.Round 86.31 to one decimal place. =
  27. 27.Which is closest to 597 + 695 + 796? (a) 2200 (b) 2300 (c) 2000 (d) 2100
  28. 28.Round 17.69 to one decimal place. =
  29. 29.Round 47.27 to one decimal place. =
  30. 30.Which is closest to 304 × 32? (Round each number first.) (a) 18000 (b) 90000 (c) 900 (d) 9000
  31. 31.Round 62904 to the nearest ten.
  32. 32.Which is closest to 3492 ÷ 49? (a) 70 (b) 35 (c) 700 (d) 140
  33. 33.Round 53.83 to one decimal place. =
  34. 34.Round 13740 to the nearest hundred.
  35. 35.Which is closest to 399 × 79? (Round each number first.) (a) 320000 (b) 64000 (c) 32000 (d) 3200
  36. 36.Which is closest to 401 × 32? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  37. 37.Which is closest to 1505 ÷ 49? (a) 30 (b) 15 (c) 300 (d) 60
  38. 38.Which is closest to 498 × 31? (Round each number first.) (a) 1500 (b) 15000 (c) 30000 (d) 150000
  39. 39.Which is closest to 903 × 41? (Round each number first.) (a) 3600 (b) 360000 (c) 72000 (d) 36000
  40. 40.Which is closest to 698 × 19? (Round each number first.) (a) 28000 (b) 1400 (c) 140000 (d) 14000

Answer key

  1. 97.5
  2. 1900
  3. 1700
  4. 1600
  5. 99.7
  6. 80
  7. 1600
  8. 80
  9. 1200
  10. 1600
  11. 1500
  12. 13.2
  13. 20000
  14. 49000
  15. 18.5
  16. 81000
  17. 50
  18. 500
  19. 36000
  20. 90
  21. 1900
  22. 2100
  23. 34000
  24. 94200
  25. 30.3
  26. 86.3
  27. 2100
  28. 17.7
  29. 47.3
  30. 9000
  31. 62900
  32. 70
  33. 53.8
  34. 13700
  35. 32000
  36. 12000
  37. 30
  38. 15000
  39. 36000
  40. 14000

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