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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 262 · 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 96012 to the nearest ten.
  2. 2.Which is closest to 301 × 52? (Round each number first.) (a) 30000 (b) 150000 (c) 1500 (d) 15000
  3. 3.Which is closest to 700 + 204 + 405? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  4. 4.Which is closest to 1400 ÷ 19? (a) 70 (b) 140 (c) 700 (d) 35
  5. 5.Which is closest to 1195 ÷ 41? (a) 30 (b) 60 (c) 300 (d) 15
  6. 6.Round 16880 to the nearest thousand.
  7. 7.Round 37643 to the nearest thousand.
  8. 8.Which is closest to 596 + 895 + 196? (a) 1600 (b) 1800 (c) 1700 (d) 1900
  9. 9.Which is closest to 305 + 401 + 204? (a) 800 (b) 900 (c) 1000 (d) 1100
  10. 10.Which is closest to 1201 ÷ 41? (a) 15 (b) 30 (c) 60 (d) 300
  11. 11.Round 83198 to the nearest hundred.
  12. 12.Round 15497 to the nearest thousand.
  13. 13.Round 45201 to the nearest thousand.
  14. 14.Which is closest to 504 × 68? (Round each number first.) (a) 35000 (b) 3500 (c) 70000 (d) 350000
  15. 15.Which is closest to 798 + 296 + 296? (a) 1400 (b) 1600 (c) 1500 (d) 1300
  16. 16.Round 58.27 to one decimal place. =
  17. 17.Round 87.32 to one decimal place. =
  18. 18.Which is closest to 198 + 503 + 297? (a) 1100 (b) 1000 (c) 900 (d) 1200
  19. 19.Which is closest to 605 ÷ 19? (a) 15 (b) 30 (c) 300 (d) 60
  20. 20.Round 88512 to the nearest thousand.
  21. 21.Round 40.39 to one decimal place. =
  22. 22.Which is closest to 495 + 197 + 702? (a) 1500 (b) 1300 (c) 1400 (d) 1600
  23. 23.Round 54245 to the nearest thousand.
  24. 24.Which is closest to 305 + 897 + 697? (a) 1800 (b) 2000 (c) 1900 (d) 2100
  25. 25.Round 13.11 to one decimal place. =
  26. 26.Round 78.43 to one decimal place. =
  27. 27.Round 82797 to the nearest thousand.
  28. 28.Which is closest to 397 × 29? (Round each number first.) (a) 12000 (b) 24000 (c) 120000 (d) 1200
  29. 29.Which is closest to 1502 ÷ 31? (a) 25 (b) 50 (c) 500 (d) 100
  30. 30.Which is closest to 1006 ÷ 19? (a) 50 (b) 25 (c) 500 (d) 100
  31. 31.Round 96.41 to one decimal place. =
  32. 32.Which is closest to 1998 ÷ 49? (a) 80 (b) 400 (c) 20 (d) 40
  33. 33.Which is closest to 701 × 19? (Round each number first.) (a) 140000 (b) 1400 (c) 28000 (d) 14000
  34. 34.Which is closest to 1607 ÷ 19? (a) 40 (b) 160 (c) 80 (d) 800
  35. 35.Round 62181 to the nearest hundred.
  36. 36.Which is closest to 299 × 28? (Round each number first.) (a) 900 (b) 9000 (c) 90000 (d) 18000
  37. 37.Which is closest to 501 × 18? (Round each number first.) (a) 100000 (b) 10000 (c) 20000 (d) 1000
  38. 38.Round 23739 to the nearest hundred.
  39. 39.Which is closest to 597 × 38? (Round each number first.) (a) 240000 (b) 24000 (c) 48000 (d) 2400
  40. 40.Which is closest to 799 + 803 + 97? (a) 1900 (b) 1600 (c) 1800 (d) 1700

Answer key

  1. 96010
  2. 15000
  3. 1300
  4. 70
  5. 30
  6. 17000
  7. 38000
  8. 1700
  9. 900
  10. 30
  11. 83200
  12. 15000
  13. 45000
  14. 35000
  15. 1400
  16. 58.3
  17. 87.3
  18. 1000
  19. 30
  20. 89000
  21. 40.4
  22. 1400
  23. 54000
  24. 1900
  25. 13.1
  26. 78.4
  27. 83000
  28. 12000
  29. 50
  30. 50
  31. 96.4
  32. 40
  33. 14000
  34. 80
  35. 62200
  36. 9000
  37. 10000
  38. 23700
  39. 24000
  40. 1700

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