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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 509 · 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 82.77 to one decimal place. =
  2. 2.Round 26.89 to one decimal place. =
  3. 3.Which is closest to 903 × 79? (Round each number first.) (a) 144000 (b) 7200 (c) 72000 (d) 720000
  4. 4.Which is closest to 99 + 195 + 696? (a) 1200 (b) 1100 (c) 1000 (d) 900
  5. 5.Round 53.58 to one decimal place. =
  6. 6.Which is closest to 3994 ÷ 51? (a) 800 (b) 40 (c) 80 (d) 160
  7. 7.Round 26.61 to one decimal place. =
  8. 8.Which is closest to 896 × 39? (Round each number first.) (a) 72000 (b) 3600 (c) 360000 (d) 36000
  9. 9.Round 98.19 to one decimal place. =
  10. 10.Round 66997 to the nearest ten.
  11. 11.Which is closest to 2701 ÷ 29? (a) 180 (b) 90 (c) 900 (d) 45
  12. 12.Which is closest to 1007 ÷ 49? (a) 40 (b) 10 (c) 20 (d) 200
  13. 13.Which is closest to 600 × 61? (Round each number first.) (a) 360000 (b) 72000 (c) 3600 (d) 36000
  14. 14.Which is closest to 95 + 102 + 305? (a) 400 (b) 700 (c) 600 (d) 500
  15. 15.Which is closest to 502 × 69? (Round each number first.) (a) 3500 (b) 350000 (c) 70000 (d) 35000
  16. 16.Round 12045 to the nearest thousand.
  17. 17.Which is closest to 1200 ÷ 29? (a) 40 (b) 400 (c) 20 (d) 80
  18. 18.Which is closest to 1608 ÷ 21? (a) 800 (b) 80 (c) 40 (d) 160
  19. 19.Which is closest to 195 + 299 + 703? (a) 1300 (b) 1200 (c) 1100 (d) 1400
  20. 20.Round 86.42 to one decimal place. =
  21. 21.Round 16146 to the nearest ten.
  22. 22.Round 65090 to the nearest hundred.
  23. 23.Round 5926 to the nearest thousand.
  24. 24.Round 14.71 to one decimal place. =
  25. 25.Round 26.29 to one decimal place. =
  26. 26.Round 71.81 to one decimal place. =
  27. 27.Round 36813 to the nearest hundred.
  28. 28.Round 11793 to the nearest hundred.
  29. 29.Which is closest to 796 + 200 + 696? (a) 1700 (b) 1900 (c) 1600 (d) 1800
  30. 30.Round 38339 to the nearest ten.
  31. 31.Which is closest to 501 × 89? (Round each number first.) (a) 90000 (b) 450000 (c) 4500 (d) 45000
  32. 32.Which is closest to 697 × 68? (Round each number first.) (a) 4900 (b) 98000 (c) 49000 (d) 490000
  33. 33.Which is closest to 3505 ÷ 51? (a) 70 (b) 700 (c) 35 (d) 140
  34. 34.Round 71829 to the nearest hundred.
  35. 35.Round 15703 to the nearest thousand.
  36. 36.Which is closest to 301 + 895 + 303? (a) 1700 (b) 1500 (c) 1600 (d) 1400
  37. 37.Round 88.17 to one decimal place. =
  38. 38.Which is closest to 804 × 41? (Round each number first.) (a) 64000 (b) 320000 (c) 3200 (d) 32000
  39. 39.Which is closest to 201 × 71? (Round each number first.) (a) 28000 (b) 140000 (c) 1400 (d) 14000
  40. 40.Which is closest to 902 + 604 + 599? (a) 2200 (b) 2000 (c) 2100 (d) 2300

Answer key

  1. 82.8
  2. 26.9
  3. 72000
  4. 1000
  5. 53.6
  6. 80
  7. 26.6
  8. 36000
  9. 98.2
  10. 67000
  11. 90
  12. 20
  13. 36000
  14. 500
  15. 35000
  16. 12000
  17. 40
  18. 80
  19. 1200
  20. 86.4
  21. 16150
  22. 65100
  23. 6000
  24. 14.7
  25. 26.3
  26. 71.8
  27. 36800
  28. 11800
  29. 1700
  30. 38340
  31. 45000
  32. 49000
  33. 70
  34. 71800
  35. 16000
  36. 1500
  37. 88.2
  38. 32000
  39. 14000
  40. 2100

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