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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 448 · 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 304 + 901 + 295? (a) 1600 (b) 1400 (c) 1700 (d) 1500
  2. 2.Which is closest to 200 + 205 + 99? (a) 600 (b) 400 (c) 500 (d) 700
  3. 3.Which is closest to 701 × 90? (Round each number first.) (a) 6300 (b) 630000 (c) 63000 (d) 126000
  4. 4.Which is closest to 404 × 29? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  5. 5.Round 73.06 to one decimal place. =
  6. 6.Which is closest to 1201 ÷ 29? (a) 40 (b) 20 (c) 80 (d) 400
  7. 7.Round 12376 to the nearest hundred.
  8. 8.Round 13862 to the nearest thousand.
  9. 9.Round 83.81 to one decimal place. =
  10. 10.Round 50089 to the nearest ten.
  11. 11.Which is closest to 896 + 496 + 195? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  12. 12.Which is closest to 2402 ÷ 39? (a) 120 (b) 30 (c) 60 (d) 600
  13. 13.Which is closest to 698 + 398 + 503? (a) 1800 (b) 1600 (c) 1500 (d) 1700
  14. 14.Which is closest to 599 × 48? (Round each number first.) (a) 30000 (b) 60000 (c) 300000 (d) 3000
  15. 15.Which is closest to 1806 ÷ 21? (a) 900 (b) 45 (c) 90 (d) 180
  16. 16.Which is closest to 2999 ÷ 51? (a) 120 (b) 30 (c) 60 (d) 600
  17. 17.Which is closest to 604 × 81? (Round each number first.) (a) 4800 (b) 96000 (c) 480000 (d) 48000
  18. 18.Which is closest to 397 × 22? (Round each number first.) (a) 8000 (b) 80000 (c) 16000 (d) 800
  19. 19.Which is closest to 2792 ÷ 39? (a) 35 (b) 700 (c) 70 (d) 140
  20. 20.Round 28627 to the nearest hundred.
  21. 21.Round 90.16 to one decimal place. =
  22. 22.Round 70244 to the nearest thousand.
  23. 23.Which is closest to 298 × 29? (Round each number first.) (a) 18000 (b) 900 (c) 90000 (d) 9000
  24. 24.Which is closest to 504 + 299 + 702? (a) 1400 (b) 1600 (c) 1500 (d) 1700
  25. 25.Which is closest to 504 × 92? (Round each number first.) (a) 4500 (b) 45000 (c) 450000 (d) 90000
  26. 26.Which is closest to 2706 ÷ 29? (a) 900 (b) 90 (c) 45 (d) 180
  27. 27.Round 35138 to the nearest hundred.
  28. 28.Which is closest to 699 + 495 + 499? (a) 1900 (b) 1800 (c) 1600 (d) 1700
  29. 29.Which is closest to 703 + 397 + 702? (a) 1900 (b) 2000 (c) 1800 (d) 1700
  30. 30.Which is closest to 504 × 88? (Round each number first.) (a) 45000 (b) 4500 (c) 90000 (d) 450000
  31. 31.Which is closest to 104 + 899 + 802? (a) 1700 (b) 2000 (c) 1800 (d) 1900
  32. 32.Round 65955 to the nearest hundred.
  33. 33.Which is closest to 902 + 804 + 396? (a) 2200 (b) 2000 (c) 2300 (d) 2100
  34. 34.Round 71.36 to one decimal place. =
  35. 35.Round 94219 to the nearest ten.
  36. 36.Round 66.47 to one decimal place. =
  37. 37.Round 56842 to the nearest ten.
  38. 38.Which is closest to 298 × 68? (Round each number first.) (a) 210000 (b) 42000 (c) 21000 (d) 2100
  39. 39.Which is closest to 403 × 50? (Round each number first.) (a) 40000 (b) 200000 (c) 20000 (d) 2000
  40. 40.Which is closest to 404 × 39? (Round each number first.) (a) 160000 (b) 1600 (c) 16000 (d) 32000

Answer key

  1. 1500
  2. 500
  3. 63000
  4. 12000
  5. 73.1
  6. 40
  7. 12400
  8. 14000
  9. 83.8
  10. 50090
  11. 1600
  12. 60
  13. 1600
  14. 30000
  15. 90
  16. 60
  17. 48000
  18. 8000
  19. 70
  20. 28600
  21. 90.2
  22. 70000
  23. 9000
  24. 1500
  25. 45000
  26. 90
  27. 35100
  28. 1700
  29. 1800
  30. 45000
  31. 1800
  32. 66000
  33. 2100
  34. 71.4
  35. 94220
  36. 66.5
  37. 56840
  38. 21000
  39. 20000
  40. 16000

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