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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 720 · 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 78536 to the nearest ten.
  2. 2.Which is closest to 1196 ÷ 39? (a) 60 (b) 300 (c) 30 (d) 15
  3. 3.Which is closest to 496 × 89? (Round each number first.) (a) 4500 (b) 90000 (c) 45000 (d) 450000
  4. 4.Round 7099 to the nearest ten.
  5. 5.Round 70153 to the nearest ten.
  6. 6.Round 17774 to the nearest ten.
  7. 7.Round 83.73 to one decimal place. =
  8. 8.Which is closest to 403 + 100 + 497? (a) 1000 (b) 1100 (c) 1200 (d) 900
  9. 9.Round 20329 to the nearest thousand.
  10. 10.Round 19404 to the nearest ten.
  11. 11.Round 91.88 to one decimal place. =
  12. 12.Which is closest to 2396 ÷ 41? (a) 120 (b) 30 (c) 600 (d) 60
  13. 13.Which is closest to 295 + 205 + 299? (a) 800 (b) 700 (c) 900 (d) 1000
  14. 14.Which is closest to 501 × 91? (Round each number first.) (a) 90000 (b) 450000 (c) 45000 (d) 4500
  15. 15.Which is closest to 501 × 21? (Round each number first.) (a) 1000 (b) 20000 (c) 100000 (d) 10000
  16. 16.Round 63.58 to one decimal place. =
  17. 17.Round 46948 to the nearest hundred.
  18. 18.Which is closest to 805 ÷ 39? (a) 20 (b) 40 (c) 10 (d) 200
  19. 19.Round 35219 to the nearest ten.
  20. 20.Which is closest to 496 + 203 + 197? (a) 900 (b) 1000 (c) 1100 (d) 800
  21. 21.Round 51.31 to one decimal place. =
  22. 22.Which is closest to 398 × 51? (Round each number first.) (a) 20000 (b) 40000 (c) 2000 (d) 200000
  23. 23.Which is closest to 602 × 89? (Round each number first.) (a) 5400 (b) 540000 (c) 108000 (d) 54000
  24. 24.Which is closest to 1792 ÷ 29? (a) 120 (b) 30 (c) 60 (d) 600
  25. 25.Round 14362 to the nearest ten.
  26. 26.Round 25287 to the nearest hundred.
  27. 27.Which is closest to 598 × 21? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  28. 28.Round 10.82 to one decimal place. =
  29. 29.Which is closest to 1508 ÷ 49? (a) 60 (b) 15 (c) 300 (d) 30
  30. 30.Which is closest to 1804 ÷ 19? (a) 180 (b) 900 (c) 90 (d) 45
  31. 31.Which is closest to 898 + 599 + 801? (a) 2400 (b) 2200 (c) 2300 (d) 2500
  32. 32.Round 34362 to the nearest ten.
  33. 33.Round 69839 to the nearest thousand.
  34. 34.Which is closest to 602 + 597 + 299? (a) 1700 (b) 1600 (c) 1400 (d) 1500
  35. 35.Round 41.59 to one decimal place. =
  36. 36.Which is closest to 894 ÷ 29? (a) 15 (b) 60 (c) 300 (d) 30
  37. 37.Which is closest to 1596 ÷ 39? (a) 20 (b) 40 (c) 400 (d) 80
  38. 38.Which is closest to 809 ÷ 21? (a) 40 (b) 20 (c) 80 (d) 400
  39. 39.Round 78717 to the nearest thousand.
  40. 40.Which is closest to 198 × 80? (Round each number first.) (a) 16000 (b) 32000 (c) 160000 (d) 1600

Answer key

  1. 78540
  2. 30
  3. 45000
  4. 7100
  5. 70150
  6. 17770
  7. 83.7
  8. 1000
  9. 20000
  10. 19400
  11. 91.9
  12. 60
  13. 800
  14. 45000
  15. 10000
  16. 63.6
  17. 46900
  18. 20
  19. 35220
  20. 900
  21. 51.3
  22. 20000
  23. 54000
  24. 60
  25. 14360
  26. 25300
  27. 12000
  28. 10.8
  29. 30
  30. 90
  31. 2300
  32. 34360
  33. 70000
  34. 1500
  35. 41.6
  36. 30
  37. 40
  38. 40
  39. 79000
  40. 16000

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