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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 855 · 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 299 × 79? (Round each number first.) (a) 2400 (b) 24000 (c) 240000 (d) 48000
  2. 2.Round 89895 to the nearest hundred.
  3. 3.Which is closest to 300 + 195 + 497? (a) 1100 (b) 1000 (c) 1200 (d) 900
  4. 4.Which is closest to 201 × 22? (Round each number first.) (a) 4000 (b) 400 (c) 40000 (d) 8000
  5. 5.Round 40658 to the nearest hundred.
  6. 6.Which is closest to 398 × 41? (Round each number first.) (a) 32000 (b) 16000 (c) 1600 (d) 160000
  7. 7.Round 32.53 to one decimal place. =
  8. 8.Round 87.32 to one decimal place. =
  9. 9.Which is closest to 398 × 40? (Round each number first.) (a) 1600 (b) 160000 (c) 32000 (d) 16000
  10. 10.Round 40028 to the nearest thousand.
  11. 11.Round 10.37 to one decimal place. =
  12. 12.Round 73.78 to one decimal place. =
  13. 13.Which is closest to 1505 ÷ 29? (a) 25 (b) 500 (c) 50 (d) 100
  14. 14.Round 23.23 to one decimal place. =
  15. 15.Which is closest to 900 × 79? (Round each number first.) (a) 144000 (b) 720000 (c) 7200 (d) 72000
  16. 16.Which is closest to 598 + 795 + 601? (a) 2100 (b) 2200 (c) 1900 (d) 2000
  17. 17.Which is closest to 1804 ÷ 31? (a) 30 (b) 600 (c) 120 (d) 60
  18. 18.Which is closest to 2707 ÷ 29? (a) 90 (b) 45 (c) 900 (d) 180
  19. 19.Which is closest to 2708 ÷ 31? (a) 180 (b) 90 (c) 45 (d) 900
  20. 20.Which is closest to 401 × 70? (Round each number first.) (a) 280000 (b) 28000 (c) 56000 (d) 2800
  21. 21.Which is closest to 3505 ÷ 51? (a) 700 (b) 140 (c) 35 (d) 70
  22. 22.Which is closest to 701 × 91? (Round each number first.) (a) 630000 (b) 126000 (c) 6300 (d) 63000
  23. 23.Round 36.42 to one decimal place. =
  24. 24.Round 73.89 to one decimal place. =
  25. 25.Which is closest to 1205 ÷ 19? (a) 600 (b) 120 (c) 30 (d) 60
  26. 26.Which is closest to 697 × 18? (Round each number first.) (a) 28000 (b) 14000 (c) 1400 (d) 140000
  27. 27.Which is closest to 607 ÷ 21? (a) 300 (b) 60 (c) 15 (d) 30
  28. 28.Which is closest to 2007 ÷ 49? (a) 400 (b) 20 (c) 80 (d) 40
  29. 29.Round 84.28 to one decimal place. =
  30. 30.Round 8520 to the nearest hundred.
  31. 31.Which is closest to 602 × 81? (Round each number first.) (a) 48000 (b) 4800 (c) 96000 (d) 480000
  32. 32.Which is closest to 897 × 72? (Round each number first.) (a) 630000 (b) 63000 (c) 6300 (d) 126000
  33. 33.Which is closest to 2408 ÷ 29? (a) 800 (b) 160 (c) 40 (d) 80
  34. 34.Round 76962 to the nearest ten.
  35. 35.Round 98.68 to one decimal place. =
  36. 36.Round 90097 to the nearest hundred.
  37. 37.Which is closest to 605 + 701 + 503? (a) 1800 (b) 1900 (c) 2000 (d) 1700
  38. 38.Round 30784 to the nearest thousand.
  39. 39.Which is closest to 1802 ÷ 31? (a) 600 (b) 30 (c) 120 (d) 60
  40. 40.Which is closest to 101 + 105 + 895? (a) 1300 (b) 1200 (c) 1000 (d) 1100

Answer key

  1. 24000
  2. 89900
  3. 1000
  4. 4000
  5. 40700
  6. 16000
  7. 32.5
  8. 87.3
  9. 16000
  10. 40000
  11. 10.4
  12. 73.8
  13. 50
  14. 23.2
  15. 72000
  16. 2000
  17. 60
  18. 90
  19. 90
  20. 28000
  21. 70
  22. 63000
  23. 36.4
  24. 73.9
  25. 60
  26. 14000
  27. 30
  28. 40
  29. 84.3
  30. 8500
  31. 48000
  32. 63000
  33. 80
  34. 76960
  35. 98.7
  36. 90100
  37. 1800
  38. 31000
  39. 60
  40. 1100

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