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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 7 · 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 16.14 to one decimal place. =
  2. 2.Which is closest to 900 × 72? (Round each number first.) (a) 6300 (b) 126000 (c) 630000 (d) 63000
  3. 3.Round 76.88 to one decimal place. =
  4. 4.Round 46.47 to one decimal place. =
  5. 5.Round 32872 to the nearest thousand.
  6. 6.Round 17892 to the nearest hundred.
  7. 7.Round 77.52 to one decimal place. =
  8. 8.Round 39.92 to one decimal place. =
  9. 9.Which is closest to 801 × 20? (Round each number first.) (a) 160000 (b) 1600 (c) 32000 (d) 16000
  10. 10.Which is closest to 601 × 91? (Round each number first.) (a) 54000 (b) 540000 (c) 108000 (d) 5400
  11. 11.Which is closest to 404 + 405 + 402? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  12. 12.Round 51.81 to one decimal place. =
  13. 13.Round 27844 to the nearest thousand.
  14. 14.Round 69051 to the nearest hundred.
  15. 15.Round 8253 to the nearest hundred.
  16. 16.Which is closest to 1794 ÷ 31? (a) 600 (b) 30 (c) 60 (d) 120
  17. 17.Which is closest to 204 + 104 + 797? (a) 1300 (b) 1100 (c) 1000 (d) 1200
  18. 18.Which is closest to 607 ÷ 21? (a) 60 (b) 15 (c) 30 (d) 300
  19. 19.Which is closest to 596 × 70? (Round each number first.) (a) 420000 (b) 84000 (c) 42000 (d) 4200
  20. 20.Round 53.13 to one decimal place. =
  21. 21.Which is closest to 803 × 19? (Round each number first.) (a) 1600 (b) 16000 (c) 32000 (d) 160000
  22. 22.Which is closest to 1606 ÷ 21? (a) 40 (b) 80 (c) 160 (d) 800
  23. 23.Which is closest to 800 × 18? (Round each number first.) (a) 1600 (b) 32000 (c) 160000 (d) 16000
  24. 24.Which is closest to 4501 ÷ 49? (a) 180 (b) 90 (c) 900 (d) 45
  25. 25.Round 10.11 to one decimal place. =
  26. 26.Round 84.49 to one decimal place. =
  27. 27.Round 67.81 to one decimal place. =
  28. 28.Round 79528 to the nearest thousand.
  29. 29.Which is closest to 797 + 196 + 99? (a) 1100 (b) 1300 (c) 1200 (d) 1000
  30. 30.Which is closest to 199 × 62? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  31. 31.Which is closest to 803 × 88? (Round each number first.) (a) 72000 (b) 144000 (c) 7200 (d) 720000
  32. 32.Round 15.07 to one decimal place. =
  33. 33.Round 43.28 to one decimal place. =
  34. 34.Which is closest to 402 × 30? (Round each number first.) (a) 120000 (b) 24000 (c) 12000 (d) 1200
  35. 35.Which is closest to 404 × 81? (Round each number first.) (a) 32000 (b) 64000 (c) 320000 (d) 3200
  36. 36.Which is closest to 2796 ÷ 39? (a) 700 (b) 35 (c) 140 (d) 70
  37. 37.Which is closest to 998 ÷ 21? (a) 100 (b) 500 (c) 25 (d) 50
  38. 38.Which is closest to 96 + 301 + 501? (a) 1000 (b) 800 (c) 1100 (d) 900
  39. 39.Which is closest to 3205 ÷ 39? (a) 160 (b) 40 (c) 800 (d) 80
  40. 40.Which is closest to 896 + 795 + 897? (a) 2600 (b) 2500 (c) 2700 (d) 2800

Answer key

  1. 16.1
  2. 63000
  3. 76.9
  4. 46.5
  5. 33000
  6. 17900
  7. 77.5
  8. 39.9
  9. 16000
  10. 54000
  11. 1200
  12. 51.8
  13. 28000
  14. 69100
  15. 8300
  16. 60
  17. 1100
  18. 30
  19. 42000
  20. 53.1
  21. 16000
  22. 80
  23. 16000
  24. 90
  25. 10.1
  26. 84.5
  27. 67.8
  28. 80000
  29. 1100
  30. 12000
  31. 72000
  32. 15.1
  33. 43.3
  34. 12000
  35. 32000
  36. 70
  37. 50
  38. 900
  39. 80
  40. 2600

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