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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 443 · 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 400 + 300 + 496? (a) 1300 (b) 1400 (c) 1100 (d) 1200
  2. 2.Round 21136 to the nearest ten.
  3. 3.Which is closest to 704 + 895 + 495? (a) 2200 (b) 2000 (c) 2300 (d) 2100
  4. 4.Which is closest to 395 + 305 + 404? (a) 1300 (b) 1100 (c) 1000 (d) 1200
  5. 5.Which is closest to 798 ÷ 41? (a) 20 (b) 200 (c) 10 (d) 40
  6. 6.Round 67169 to the nearest hundred.
  7. 7.Which is closest to 904 × 68? (Round each number first.) (a) 6300 (b) 126000 (c) 63000 (d) 630000
  8. 8.Which is closest to 1796 ÷ 31? (a) 600 (b) 60 (c) 120 (d) 30
  9. 9.Which is closest to 899 + 896 + 695? (a) 2600 (b) 2400 (c) 2700 (d) 2500
  10. 10.Which is closest to 202 × 29? (Round each number first.) (a) 6000 (b) 60000 (c) 12000 (d) 600
  11. 11.Which is closest to 609 ÷ 21? (a) 300 (b) 60 (c) 30 (d) 15
  12. 12.Round 99.59 to one decimal place. =
  13. 13.Round 86.18 to one decimal place. =
  14. 14.Which is closest to 1207 ÷ 19? (a) 600 (b) 30 (c) 60 (d) 120
  15. 15.Round 44.76 to one decimal place. =
  16. 16.Round 84926 to the nearest thousand.
  17. 17.Which is closest to 2800 ÷ 41? (a) 140 (b) 700 (c) 35 (d) 70
  18. 18.Round 87.77 to one decimal place. =
  19. 19.Round 64287 to the nearest thousand.
  20. 20.Which is closest to 796 × 18? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  21. 21.Round 25016 to the nearest ten.
  22. 22.Which is closest to 200 × 92? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  23. 23.Which is closest to 3192 ÷ 39? (a) 800 (b) 80 (c) 40 (d) 160
  24. 24.Which is closest to 602 × 79? (Round each number first.) (a) 4800 (b) 96000 (c) 48000 (d) 480000
  25. 25.Which is closest to 1498 ÷ 49? (a) 300 (b) 60 (c) 30 (d) 15
  26. 26.Round 34169 to the nearest thousand.
  27. 27.Which is closest to 900 × 39? (Round each number first.) (a) 72000 (b) 3600 (c) 36000 (d) 360000
  28. 28.Round 97361 to the nearest thousand.
  29. 29.Round 48.33 to one decimal place. =
  30. 30.Round 86059 to the nearest ten.
  31. 31.Round 64485 to the nearest hundred.
  32. 32.Which is closest to 796 + 804 + 700? (a) 2300 (b) 2200 (c) 2500 (d) 2400
  33. 33.Which is closest to 1205 ÷ 29? (a) 400 (b) 40 (c) 80 (d) 20
  34. 34.Round 29.62 to one decimal place. =
  35. 35.Which is closest to 2008 ÷ 51? (a) 400 (b) 20 (c) 80 (d) 40
  36. 36.Which is closest to 1205 ÷ 19? (a) 60 (b) 600 (c) 30 (d) 120
  37. 37.Round 95.77 to one decimal place. =
  38. 38.Round 64338 to the nearest hundred.
  39. 39.Round 54.68 to one decimal place. =
  40. 40.Round 22791 to the nearest thousand.

Answer key

  1. 1200
  2. 21140
  3. 2100
  4. 1100
  5. 20
  6. 67200
  7. 63000
  8. 60
  9. 2500
  10. 6000
  11. 30
  12. 99.6
  13. 86.2
  14. 60
  15. 44.8
  16. 85000
  17. 70
  18. 87.8
  19. 64000
  20. 16000
  21. 25020
  22. 18000
  23. 80
  24. 48000
  25. 30
  26. 34000
  27. 36000
  28. 97000
  29. 48.3
  30. 86060
  31. 64500
  32. 2300
  33. 40
  34. 29.6
  35. 40
  36. 60
  37. 95.8
  38. 64300
  39. 54.7
  40. 23000

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