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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 542 · 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 604 × 31? (Round each number first.) (a) 180000 (b) 18000 (c) 36000 (d) 1800
  2. 2.Which is closest to 498 × 61? (Round each number first.) (a) 60000 (b) 300000 (c) 3000 (d) 30000
  3. 3.Which is closest to 303 + 903 + 798? (a) 2100 (b) 2200 (c) 2000 (d) 1900
  4. 4.Round 49377 to the nearest ten.
  5. 5.Round 69221 to the nearest ten.
  6. 6.Round 64482 to the nearest ten.
  7. 7.Round 20098 to the nearest ten.
  8. 8.Which is closest to 1804 ÷ 19? (a) 45 (b) 90 (c) 180 (d) 900
  9. 9.Which is closest to 203 + 299 + 703? (a) 1100 (b) 1200 (c) 1300 (d) 1400
  10. 10.Which is closest to 298 × 69? (Round each number first.) (a) 2100 (b) 42000 (c) 210000 (d) 21000
  11. 11.Which is closest to 795 + 297 + 104? (a) 1300 (b) 1200 (c) 1100 (d) 1400
  12. 12.Which is closest to 202 + 797 + 699? (a) 1800 (b) 1900 (c) 1700 (d) 1600
  13. 13.Which is closest to 302 × 32? (Round each number first.) (a) 9000 (b) 90000 (c) 900 (d) 18000
  14. 14.Round 12.53 to one decimal place. =
  15. 15.Which is closest to 599 × 49? (Round each number first.) (a) 3000 (b) 60000 (c) 300000 (d) 30000
  16. 16.Which is closest to 1195 ÷ 29? (a) 20 (b) 40 (c) 400 (d) 80
  17. 17.Round 98.76 to one decimal place. =
  18. 18.Round 89596 to the nearest thousand.
  19. 19.Round 97.76 to one decimal place. =
  20. 20.Which is closest to 599 + 800 + 895? (a) 2300 (b) 2500 (c) 2200 (d) 2400
  21. 21.Round 2808 to the nearest thousand.
  22. 22.Which is closest to 405 + 898 + 798? (a) 2100 (b) 2300 (c) 2000 (d) 2200
  23. 23.Which is closest to 297 + 99 + 100? (a) 600 (b) 700 (c) 400 (d) 500
  24. 24.Which is closest to 406 ÷ 21? (a) 10 (b) 40 (c) 20 (d) 200
  25. 25.Which is closest to 799 + 398 + 500? (a) 1900 (b) 1700 (c) 1800 (d) 1600
  26. 26.Round 17204 to the nearest thousand.
  27. 27.Which is closest to 1195 ÷ 19? (a) 120 (b) 30 (c) 600 (d) 60
  28. 28.Which is closest to 798 × 59? (Round each number first.) (a) 4800 (b) 480000 (c) 48000 (d) 96000
  29. 29.Round 35078 to the nearest thousand.
  30. 30.Round 53352 to the nearest hundred.
  31. 31.Which is closest to 904 × 50? (Round each number first.) (a) 4500 (b) 45000 (c) 90000 (d) 450000
  32. 32.Which is closest to 3003 ÷ 49? (a) 600 (b) 30 (c) 120 (d) 60
  33. 33.Which is closest to 601 + 395 + 297? (a) 1400 (b) 1500 (c) 1300 (d) 1200
  34. 34.Round 38503 to the nearest hundred.
  35. 35.Round 71.23 to one decimal place. =
  36. 36.Round 35.42 to one decimal place. =
  37. 37.Round 64082 to the nearest thousand.
  38. 38.Which is closest to 201 + 402 + 197? (a) 800 (b) 1000 (c) 700 (d) 900
  39. 39.Round 43250 to the nearest thousand.
  40. 40.Which is closest to 403 × 50? (Round each number first.) (a) 200000 (b) 20000 (c) 2000 (d) 40000

Answer key

  1. 18000
  2. 30000
  3. 2000
  4. 49380
  5. 69220
  6. 64480
  7. 20100
  8. 90
  9. 1200
  10. 21000
  11. 1200
  12. 1700
  13. 9000
  14. 12.5
  15. 30000
  16. 40
  17. 98.8
  18. 90000
  19. 97.8
  20. 2300
  21. 3000
  22. 2100
  23. 500
  24. 20
  25. 1700
  26. 17000
  27. 60
  28. 48000
  29. 35000
  30. 53400
  31. 45000
  32. 60
  33. 1300
  34. 38500
  35. 71.2
  36. 35.4
  37. 64000
  38. 800
  39. 43000
  40. 20000

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