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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 604 · 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 501 × 40? (Round each number first.) (a) 40000 (b) 20000 (c) 2000 (d) 200000
  2. 2.Round 84562 to the nearest ten.
  3. 3.Which is closest to 302 + 698 + 796? (a) 1800 (b) 1700 (c) 2000 (d) 1900
  4. 4.Which is closest to 298 + 203 + 899? (a) 1400 (b) 1600 (c) 1300 (d) 1500
  5. 5.Which is closest to 397 + 96 + 604? (a) 1200 (b) 1300 (c) 1100 (d) 1000
  6. 6.Which is closest to 496 × 82? (Round each number first.) (a) 80000 (b) 40000 (c) 400000 (d) 4000
  7. 7.Which is closest to 298 × 78? (Round each number first.) (a) 24000 (b) 2400 (c) 240000 (d) 48000
  8. 8.Round 29.94 to one decimal place. =
  9. 9.Which is closest to 3208 ÷ 41? (a) 80 (b) 800 (c) 160 (d) 40
  10. 10.Round 28825 to the nearest hundred.
  11. 11.Round 19.76 to one decimal place. =
  12. 12.Round 18281 to the nearest thousand.
  13. 13.Round 52.43 to one decimal place. =
  14. 14.Which is closest to 1793 ÷ 29? (a) 60 (b) 30 (c) 600 (d) 120
  15. 15.Which is closest to 2508 ÷ 51? (a) 50 (b) 100 (c) 500 (d) 25
  16. 16.Which is closest to 403 + 97 + 403? (a) 1100 (b) 900 (c) 1000 (d) 800
  17. 17.Round 91.06 to one decimal place. =
  18. 18.Which is closest to 97 + 896 + 201? (a) 1200 (b) 1100 (c) 1400 (d) 1300
  19. 19.Round 61.58 to one decimal place. =
  20. 20.Which is closest to 3597 ÷ 41? (a) 90 (b) 45 (c) 180 (d) 900
  21. 21.Which is closest to 2403 ÷ 29? (a) 40 (b) 80 (c) 160 (d) 800
  22. 22.Round 85294 to the nearest ten.
  23. 23.Which is closest to 4493 ÷ 51? (a) 45 (b) 90 (c) 900 (d) 180
  24. 24.Round 33.41 to one decimal place. =
  25. 25.Which is closest to 597 × 60? (Round each number first.) (a) 3600 (b) 36000 (c) 360000 (d) 72000
  26. 26.Which is closest to 902 × 41? (Round each number first.) (a) 36000 (b) 3600 (c) 360000 (d) 72000
  27. 27.Which is closest to 304 + 101 + 703? (a) 1300 (b) 1000 (c) 1100 (d) 1200
  28. 28.Which is closest to 598 × 78? (Round each number first.) (a) 48000 (b) 480000 (c) 96000 (d) 4800
  29. 29.Which is closest to 604 + 104 + 98? (a) 700 (b) 1000 (c) 800 (d) 900
  30. 30.Which is closest to 504 × 19? (Round each number first.) (a) 20000 (b) 1000 (c) 100000 (d) 10000
  31. 31.Which is closest to 905 + 797 + 396? (a) 2100 (b) 2300 (c) 2200 (d) 2000
  32. 32.Round 44597 to the nearest thousand.
  33. 33.Which is closest to 806 ÷ 39? (a) 200 (b) 40 (c) 10 (d) 20
  34. 34.Which is closest to 1604 ÷ 21? (a) 160 (b) 800 (c) 40 (d) 80
  35. 35.Round 13.54 to one decimal place. =
  36. 36.Which is closest to 404 + 904 + 898? (a) 2400 (b) 2100 (c) 2300 (d) 2200
  37. 37.Which is closest to 203 × 70? (Round each number first.) (a) 140000 (b) 14000 (c) 28000 (d) 1400
  38. 38.Which is closest to 502 × 32? (Round each number first.) (a) 15000 (b) 150000 (c) 30000 (d) 1500
  39. 39.Round 12.56 to one decimal place. =
  40. 40.Which is closest to 704 × 92? (Round each number first.) (a) 6300 (b) 63000 (c) 630000 (d) 126000

Answer key

  1. 20000
  2. 84560
  3. 1800
  4. 1400
  5. 1100
  6. 40000
  7. 24000
  8. 29.9
  9. 80
  10. 28800
  11. 19.8
  12. 18000
  13. 52.4
  14. 60
  15. 50
  16. 900
  17. 91.1
  18. 1200
  19. 61.6
  20. 90
  21. 80
  22. 85290
  23. 90
  24. 33.4
  25. 36000
  26. 36000
  27. 1100
  28. 48000
  29. 800
  30. 10000
  31. 2100
  32. 45000
  33. 20
  34. 80
  35. 13.5
  36. 2200
  37. 14000
  38. 15000
  39. 12.6
  40. 63000

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