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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 199 · 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 1607 ÷ 21? (a) 800 (b) 160 (c) 40 (d) 80
  2. 2.Which is closest to 399 ÷ 21? (a) 200 (b) 10 (c) 20 (d) 40
  3. 3.Round 76.28 to one decimal place. =
  4. 4.Round 25461 to the nearest ten.
  5. 5.Round 99.29 to one decimal place. =
  6. 6.Which is closest to 595 + 599 + 99? (a) 1400 (b) 1200 (c) 1500 (d) 1300
  7. 7.Round 44756 to the nearest thousand.
  8. 8.Which is closest to 401 + 602 + 897? (a) 1900 (b) 2100 (c) 2000 (d) 1800
  9. 9.Which is closest to 196 × 72? (Round each number first.) (a) 1400 (b) 28000 (c) 140000 (d) 14000
  10. 10.Which is closest to 302 + 405 + 599? (a) 1400 (b) 1300 (c) 1200 (d) 1500
  11. 11.Which is closest to 301 + 401 + 300? (a) 1200 (b) 900 (c) 1100 (d) 1000
  12. 12.Which is closest to 802 × 58? (Round each number first.) (a) 480000 (b) 48000 (c) 96000 (d) 4800
  13. 13.Round 48267 to the nearest thousand.
  14. 14.Round 98.21 to one decimal place. =
  15. 15.Which is closest to 503 + 96 + 204? (a) 700 (b) 1000 (c) 900 (d) 800
  16. 16.Round 15077 to the nearest hundred.
  17. 17.Which is closest to 901 + 204 + 205? (a) 1300 (b) 1500 (c) 1400 (d) 1200
  18. 18.Round 79782 to the nearest thousand.
  19. 19.Which is closest to 797 × 30? (Round each number first.) (a) 24000 (b) 2400 (c) 48000 (d) 240000
  20. 20.Round 25284 to the nearest thousand.
  21. 21.Which is closest to 796 ÷ 19? (a) 20 (b) 40 (c) 400 (d) 80
  22. 22.Round 39.93 to one decimal place. =
  23. 23.Which is closest to 598 × 52? (Round each number first.) (a) 60000 (b) 300000 (c) 3000 (d) 30000
  24. 24.Which is closest to 198 × 28? (Round each number first.) (a) 600 (b) 12000 (c) 6000 (d) 60000
  25. 25.Which is closest to 298 + 103 + 204? (a) 600 (b) 800 (c) 500 (d) 700
  26. 26.Which is closest to 1403 ÷ 19? (a) 700 (b) 140 (c) 35 (d) 70
  27. 27.Which is closest to 1591 ÷ 19? (a) 160 (b) 80 (c) 40 (d) 800
  28. 28.Which is closest to 601 ÷ 29? (a) 200 (b) 40 (c) 10 (d) 20
  29. 29.Which is closest to 1006 ÷ 21? (a) 500 (b) 50 (c) 25 (d) 100
  30. 30.Which is closest to 803 + 600 + 698? (a) 2100 (b) 2200 (c) 2000 (d) 2300
  31. 31.Round 38418 to the nearest ten.
  32. 32.Which is closest to 302 × 32? (Round each number first.) (a) 900 (b) 90000 (c) 18000 (d) 9000
  33. 33.Which is closest to 196 + 795 + 496? (a) 1700 (b) 1400 (c) 1500 (d) 1600
  34. 34.Round 11474 to the nearest thousand.
  35. 35.Which is closest to 703 + 901 + 804? (a) 2400 (b) 2300 (c) 2500 (d) 2600
  36. 36.Round 98809 to the nearest ten.
  37. 37.Round 81943 to the nearest ten.
  38. 38.Round 12.07 to one decimal place. =
  39. 39.Round 12.73 to one decimal place. =
  40. 40.Round 21.33 to one decimal place. =

Answer key

  1. 80
  2. 20
  3. 76.3
  4. 25460
  5. 99.3
  6. 1300
  7. 45000
  8. 1900
  9. 14000
  10. 1300
  11. 1000
  12. 48000
  13. 48000
  14. 98.2
  15. 800
  16. 15100
  17. 1300
  18. 80000
  19. 24000
  20. 25000
  21. 40
  22. 39.9
  23. 30000
  24. 6000
  25. 600
  26. 70
  27. 80
  28. 20
  29. 50
  30. 2100
  31. 38420
  32. 9000
  33. 1500
  34. 11000
  35. 2400
  36. 98810
  37. 81940
  38. 12.1
  39. 12.7
  40. 21.3

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