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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 180 · 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 898 × 60? (Round each number first.) (a) 540000 (b) 54000 (c) 108000 (d) 5400
  2. 2.Round 21648 to the nearest hundred.
  3. 3.Round 34309 to the nearest hundred.
  4. 4.Which is closest to 498 × 30? (Round each number first.) (a) 150000 (b) 15000 (c) 1500 (d) 30000
  5. 5.Which is closest to 702 × 72? (Round each number first.) (a) 490000 (b) 98000 (c) 49000 (d) 4900
  6. 6.Round 26542 to the nearest hundred.
  7. 7.Round 64.66 to one decimal place. =
  8. 8.Round 68.88 to one decimal place. =
  9. 9.Which is closest to 100 + 895 + 696? (a) 1700 (b) 1900 (c) 1600 (d) 1800
  10. 10.Which is closest to 597 + 105 + 105? (a) 800 (b) 700 (c) 900 (d) 1000
  11. 11.Round 57.71 to one decimal place. =
  12. 12.Which is closest to 204 × 78? (Round each number first.) (a) 16000 (b) 160000 (c) 1600 (d) 32000
  13. 13.Which is closest to 599 ÷ 21? (a) 300 (b) 15 (c) 60 (d) 30
  14. 14.Which is closest to 795 + 301 + 104? (a) 1300 (b) 1400 (c) 1200 (d) 1100
  15. 15.Which is closest to 603 + 203 + 603? (a) 1600 (b) 1300 (c) 1400 (d) 1500
  16. 16.Round 99810 to the nearest thousand.
  17. 17.Round 51.66 to one decimal place. =
  18. 18.Which is closest to 201 × 90? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  19. 19.Round 22525 to the nearest hundred.
  20. 20.Round 93.07 to one decimal place. =
  21. 21.Round 77367 to the nearest hundred.
  22. 22.Round 69.82 to one decimal place. =
  23. 23.Which is closest to 198 × 18? (Round each number first.) (a) 8000 (b) 400 (c) 4000 (d) 40000
  24. 24.Round 95.68 to one decimal place. =
  25. 25.Which is closest to 899 ÷ 29? (a) 300 (b) 30 (c) 60 (d) 15
  26. 26.Round 34.48 to one decimal place. =
  27. 27.Which is closest to 502 + 199 + 96? (a) 900 (b) 700 (c) 1000 (d) 800
  28. 28.Round 72.08 to one decimal place. =
  29. 29.Round 26.68 to one decimal place. =
  30. 30.Which is closest to 2109 ÷ 31? (a) 700 (b) 70 (c) 140 (d) 35
  31. 31.Which is closest to 200 × 28? (Round each number first.) (a) 6000 (b) 12000 (c) 600 (d) 60000
  32. 32.Which is closest to 1609 ÷ 39? (a) 40 (b) 400 (c) 80 (d) 20
  33. 33.Which is closest to 894 ÷ 29? (a) 30 (b) 60 (c) 15 (d) 300
  34. 34.Round 13.43 to one decimal place. =
  35. 35.Round 27.29 to one decimal place. =
  36. 36.Which is closest to 796 × 68? (Round each number first.) (a) 5600 (b) 112000 (c) 560000 (d) 56000
  37. 37.Round 12.14 to one decimal place. =
  38. 38.Round 49591 to the nearest ten.
  39. 39.Which is closest to 598 × 92? (Round each number first.) (a) 54000 (b) 540000 (c) 5400 (d) 108000
  40. 40.Round 58.64 to one decimal place. =

Answer key

  1. 54000
  2. 21600
  3. 34300
  4. 15000
  5. 49000
  6. 26500
  7. 64.7
  8. 68.9
  9. 1700
  10. 800
  11. 57.7
  12. 16000
  13. 30
  14. 1200
  15. 1400
  16. 100000
  17. 51.7
  18. 18000
  19. 22500
  20. 93.1
  21. 77400
  22. 69.8
  23. 4000
  24. 95.7
  25. 30
  26. 34.5
  27. 800
  28. 72.1
  29. 26.7
  30. 70
  31. 6000
  32. 40
  33. 30
  34. 13.4
  35. 27.3
  36. 56000
  37. 12.1
  38. 49590
  39. 54000
  40. 58.6

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