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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 936 · 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 48.61 to one decimal place. =
  2. 2.Which is closest to 805 + 199 + 99? (a) 1100 (b) 1200 (c) 1000 (d) 1300
  3. 3.Which is closest to 496 × 28? (Round each number first.) (a) 1500 (b) 15000 (c) 30000 (d) 150000
  4. 4.Which is closest to 2007 ÷ 39? (a) 25 (b) 100 (c) 500 (d) 50
  5. 5.Round 23282 to the nearest thousand.
  6. 6.Round 73.44 to one decimal place. =
  7. 7.Which is closest to 397 × 69? (Round each number first.) (a) 280000 (b) 2800 (c) 28000 (d) 56000
  8. 8.Which is closest to 196 + 703 + 595? (a) 1600 (b) 1400 (c) 1500 (d) 1700
  9. 9.Which is closest to 697 + 501 + 97? (a) 1300 (b) 1200 (c) 1500 (d) 1400
  10. 10.Which is closest to 200 × 89? (Round each number first.) (a) 18000 (b) 1800 (c) 36000 (d) 180000
  11. 11.Round 19186 to the nearest ten.
  12. 12.Round 49096 to the nearest ten.
  13. 13.Round 83742 to the nearest hundred.
  14. 14.Round 17242 to the nearest thousand.
  15. 15.Which is closest to 296 × 68? (Round each number first.) (a) 210000 (b) 42000 (c) 2100 (d) 21000
  16. 16.Which is closest to 196 × 28? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
  17. 17.Which is closest to 696 + 97 + 204? (a) 1200 (b) 1000 (c) 1100 (d) 900
  18. 18.Which is closest to 300 × 28? (Round each number first.) (a) 18000 (b) 9000 (c) 900 (d) 90000
  19. 19.Round 48815 to the nearest thousand.
  20. 20.Which is closest to 597 × 90? (Round each number first.) (a) 540000 (b) 108000 (c) 54000 (d) 5400
  21. 21.Round 38.34 to one decimal place. =
  22. 22.Which is closest to 601 × 82? (Round each number first.) (a) 96000 (b) 480000 (c) 4800 (d) 48000
  23. 23.Which is closest to 399 × 52? (Round each number first.) (a) 200000 (b) 40000 (c) 2000 (d) 20000
  24. 24.Round 78718 to the nearest hundred.
  25. 25.Round 50385 to the nearest thousand.
  26. 26.Round 38258 to the nearest ten.
  27. 27.Round 52399 to the nearest thousand.
  28. 28.Round 96.28 to one decimal place. =
  29. 29.Which is closest to 1805 ÷ 21? (a) 90 (b) 180 (c) 45 (d) 900
  30. 30.Round 47974 to the nearest hundred.
  31. 31.Round 89.62 to one decimal place. =
  32. 32.Which is closest to 1008 ÷ 49? (a) 10 (b) 20 (c) 40 (d) 200
  33. 33.Round 33246 to the nearest hundred.
  34. 34.Round 57.91 to one decimal place. =
  35. 35.Which is closest to 1209 ÷ 29? (a) 400 (b) 20 (c) 40 (d) 80
  36. 36.Which is closest to 403 + 898 + 205? (a) 1400 (b) 1500 (c) 1600 (d) 1700
  37. 37.Which is closest to 3001 ÷ 51? (a) 600 (b) 60 (c) 30 (d) 120
  38. 38.Which is closest to 602 × 88? (Round each number first.) (a) 54000 (b) 540000 (c) 108000 (d) 5400
  39. 39.Which is closest to 499 + 596 + 201? (a) 1400 (b) 1300 (c) 1200 (d) 1500
  40. 40.Which is closest to 297 + 504 + 498? (a) 1200 (b) 1500 (c) 1400 (d) 1300

Answer key

  1. 48.6
  2. 1100
  3. 15000
  4. 50
  5. 23000
  6. 73.4
  7. 28000
  8. 1500
  9. 1300
  10. 18000
  11. 19190
  12. 49100
  13. 83700
  14. 17000
  15. 21000
  16. 6000
  17. 1000
  18. 9000
  19. 49000
  20. 54000
  21. 38.3
  22. 48000
  23. 20000
  24. 78700
  25. 50000
  26. 38260
  27. 52000
  28. 96.3
  29. 90
  30. 48000
  31. 89.6
  32. 20
  33. 33200
  34. 57.9
  35. 40
  36. 1500
  37. 60
  38. 54000
  39. 1300
  40. 1300

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