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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 740 · 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 20.26 to one decimal place. =
  2. 2.Round 73.37 to one decimal place. =
  3. 3.Which is closest to 798 × 70? (Round each number first.) (a) 560000 (b) 5600 (c) 112000 (d) 56000
  4. 4.Which is closest to 197 + 495 + 202? (a) 800 (b) 1000 (c) 900 (d) 1100
  5. 5.Round 83.68 to one decimal place. =
  6. 6.Which is closest to 1591 ÷ 19? (a) 80 (b) 40 (c) 160 (d) 800
  7. 7.Which is closest to 699 × 82? (Round each number first.) (a) 112000 (b) 560000 (c) 5600 (d) 56000
  8. 8.Which is closest to 402 × 32? (Round each number first.) (a) 12000 (b) 1200 (c) 120000 (d) 24000
  9. 9.Round 97.52 to one decimal place. =
  10. 10.Round 98839 to the nearest ten.
  11. 11.Which is closest to 3192 ÷ 39? (a) 800 (b) 80 (c) 40 (d) 160
  12. 12.Which is closest to 400 × 91? (Round each number first.) (a) 360000 (b) 72000 (c) 3600 (d) 36000
  13. 13.Which is closest to 600 + 695 + 203? (a) 1600 (b) 1500 (c) 1400 (d) 1700
  14. 14.Which is closest to 600 + 901 + 99? (a) 1500 (b) 1800 (c) 1700 (d) 1600
  15. 15.Which is closest to 994 ÷ 21? (a) 25 (b) 50 (c) 500 (d) 100
  16. 16.Which is closest to 396 + 302 + 500? (a) 1200 (b) 1100 (c) 1400 (d) 1300
  17. 17.Round 54.76 to one decimal place. =
  18. 18.Which is closest to 304 + 197 + 704? (a) 1300 (b) 1400 (c) 1200 (d) 1100
  19. 19.Round 71638 to the nearest hundred.
  20. 20.Which is closest to 698 × 71? (Round each number first.) (a) 490000 (b) 4900 (c) 98000 (d) 49000
  21. 21.Which is closest to 901 + 300 + 801? (a) 2100 (b) 2200 (c) 1900 (d) 2000
  22. 22.Round 68956 to the nearest ten.
  23. 23.Round 65207 to the nearest ten.
  24. 24.Round 30.92 to one decimal place. =
  25. 25.Which is closest to 297 × 29? (Round each number first.) (a) 90000 (b) 18000 (c) 9000 (d) 900
  26. 26.Round 94.89 to one decimal place. =
  27. 27.Which is closest to 1505 ÷ 49? (a) 15 (b) 300 (c) 30 (d) 60
  28. 28.Which is closest to 605 ÷ 21? (a) 300 (b) 60 (c) 30 (d) 15
  29. 29.Which is closest to 2108 ÷ 29? (a) 35 (b) 70 (c) 140 (d) 700
  30. 30.Which is closest to 498 × 29? (Round each number first.) (a) 150000 (b) 1500 (c) 15000 (d) 30000
  31. 31.Which is closest to 907 ÷ 31? (a) 30 (b) 300 (c) 15 (d) 60
  32. 32.Which is closest to 2808 ÷ 41? (a) 35 (b) 140 (c) 70 (d) 700
  33. 33.Which is closest to 701 × 39? (Round each number first.) (a) 56000 (b) 280000 (c) 28000 (d) 2800
  34. 34.Which is closest to 903 + 501 + 398? (a) 2000 (b) 1900 (c) 1800 (d) 1700
  35. 35.Which is closest to 609 ÷ 29? (a) 200 (b) 10 (c) 20 (d) 40
  36. 36.Round 70703 to the nearest ten.
  37. 37.Which is closest to 795 ÷ 19? (a) 400 (b) 80 (c) 40 (d) 20
  38. 38.Which is closest to 797 × 40? (Round each number first.) (a) 320000 (b) 32000 (c) 64000 (d) 3200
  39. 39.Which is closest to 302 + 598 + 403? (a) 1400 (b) 1300 (c) 1500 (d) 1200
  40. 40.Which is closest to 798 × 81? (Round each number first.) (a) 128000 (b) 6400 (c) 640000 (d) 64000

Answer key

  1. 20.3
  2. 73.4
  3. 56000
  4. 900
  5. 83.7
  6. 80
  7. 56000
  8. 12000
  9. 97.5
  10. 98840
  11. 80
  12. 36000
  13. 1500
  14. 1600
  15. 50
  16. 1200
  17. 54.8
  18. 1200
  19. 71600
  20. 49000
  21. 2000
  22. 68960
  23. 65210
  24. 30.9
  25. 9000
  26. 94.9
  27. 30
  28. 30
  29. 70
  30. 15000
  31. 30
  32. 70
  33. 28000
  34. 1800
  35. 20
  36. 70700
  37. 40
  38. 32000
  39. 1300
  40. 64000

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