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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 829 · 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 602 × 39? (Round each number first.) (a) 240000 (b) 48000 (c) 2400 (d) 24000
  2. 2.Which is closest to 598 ÷ 21? (a) 300 (b) 15 (c) 60 (d) 30
  3. 3.Round 99.61 to one decimal place. =
  4. 4.Which is closest to 96 + 198 + 896? (a) 1100 (b) 1200 (c) 1300 (d) 1400
  5. 5.Round 37.94 to one decimal place. =
  6. 6.Which is closest to 298 × 22? (Round each number first.) (a) 600 (b) 12000 (c) 6000 (d) 60000
  7. 7.Round 55979 to the nearest hundred.
  8. 8.Round 88402 to the nearest hundred.
  9. 9.Which is closest to 595 + 102 + 203? (a) 1100 (b) 900 (c) 800 (d) 1000
  10. 10.Round 74.09 to one decimal place. =
  11. 11.Round 7598 to the nearest hundred.
  12. 12.Round 45.29 to one decimal place. =
  13. 13.Which is closest to 200 + 705 + 900? (a) 1800 (b) 1700 (c) 1900 (d) 2000
  14. 14.Round 93210 to the nearest hundred.
  15. 15.Which is closest to 700 + 301 + 799? (a) 2000 (b) 1800 (c) 1700 (d) 1900
  16. 16.Which is closest to 1804 ÷ 29? (a) 30 (b) 600 (c) 60 (d) 120
  17. 17.Which is closest to 703 + 600 + 400? (a) 1800 (b) 1700 (c) 1600 (d) 1900
  18. 18.Which is closest to 1594 ÷ 39? (a) 400 (b) 80 (c) 20 (d) 40
  19. 19.Which is closest to 502 × 39? (Round each number first.) (a) 20000 (b) 2000 (c) 200000 (d) 40000
  20. 20.Which is closest to 2009 ÷ 39? (a) 25 (b) 100 (c) 500 (d) 50
  21. 21.Which is closest to 98 + 703 + 200? (a) 1200 (b) 1000 (c) 900 (d) 1100
  22. 22.Which is closest to 799 × 42? (Round each number first.) (a) 32000 (b) 64000 (c) 320000 (d) 3200
  23. 23.Which is closest to 3194 ÷ 39? (a) 40 (b) 80 (c) 800 (d) 160
  24. 24.Which is closest to 2793 ÷ 39? (a) 70 (b) 700 (c) 140 (d) 35
  25. 25.Which is closest to 604 × 80? (Round each number first.) (a) 480000 (b) 48000 (c) 4800 (d) 96000
  26. 26.Which is closest to 897 + 501 + 705? (a) 2100 (b) 2000 (c) 2300 (d) 2200
  27. 27.Which is closest to 900 × 61? (Round each number first.) (a) 540000 (b) 108000 (c) 5400 (d) 54000
  28. 28.Which is closest to 1806 ÷ 21? (a) 45 (b) 180 (c) 90 (d) 900
  29. 29.Round 12629 to the nearest hundred.
  30. 30.Which is closest to 500 × 72? (Round each number first.) (a) 3500 (b) 35000 (c) 350000 (d) 70000
  31. 31.Which is closest to 203 + 803 + 400? (a) 1400 (b) 1600 (c) 1300 (d) 1500
  32. 32.Which is closest to 1596 ÷ 21? (a) 40 (b) 160 (c) 800 (d) 80
  33. 33.Which is closest to 408 ÷ 21? (a) 10 (b) 200 (c) 40 (d) 20
  34. 34.Which is closest to 103 + 902 + 102? (a) 1200 (b) 1000 (c) 1300 (d) 1100
  35. 35.Round 57.87 to one decimal place. =
  36. 36.Round 67988 to the nearest hundred.
  37. 37.Round 18.69 to one decimal place. =
  38. 38.Round 82104 to the nearest thousand.
  39. 39.Which is closest to 896 ÷ 31? (a) 300 (b) 15 (c) 60 (d) 30
  40. 40.Which is closest to 296 + 399 + 98? (a) 800 (b) 900 (c) 700 (d) 1000

Answer key

  1. 24000
  2. 30
  3. 99.6
  4. 1200
  5. 37.9
  6. 6000
  7. 56000
  8. 88400
  9. 900
  10. 74.1
  11. 7600
  12. 45.3
  13. 1800
  14. 93200
  15. 1800
  16. 60
  17. 1700
  18. 40
  19. 20000
  20. 50
  21. 1000
  22. 32000
  23. 80
  24. 70
  25. 48000
  26. 2100
  27. 54000
  28. 90
  29. 12600
  30. 35000
  31. 1400
  32. 80
  33. 20
  34. 1100
  35. 57.9
  36. 68000
  37. 18.7
  38. 82000
  39. 30
  40. 800

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