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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 620 · 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 396 × 18? (Round each number first.) (a) 80000 (b) 8000 (c) 800 (d) 16000
  2. 2.Round 82.94 to one decimal place. =
  3. 3.Round 29.71 to one decimal place. =
  4. 4.Round 24.58 to one decimal place. =
  5. 5.Round 20305 to the nearest thousand.
  6. 6.Round 86.43 to one decimal place. =
  7. 7.Round 28959 to the nearest thousand.
  8. 8.Round 54.24 to one decimal place. =
  9. 9.Round 15369 to the nearest thousand.
  10. 10.Which is closest to 1195 ÷ 39? (a) 60 (b) 300 (c) 15 (d) 30
  11. 11.Which is closest to 395 + 505 + 295? (a) 1400 (b) 1200 (c) 1100 (d) 1300
  12. 12.Which is closest to 2505 ÷ 51? (a) 50 (b) 100 (c) 500 (d) 25
  13. 13.Which is closest to 598 × 50? (Round each number first.) (a) 300000 (b) 3000 (c) 60000 (d) 30000
  14. 14.Round 94063 to the nearest hundred.
  15. 15.Which is closest to 795 + 504 + 801? (a) 2200 (b) 2300 (c) 2000 (d) 2100
  16. 16.Which is closest to 798 + 404 + 200? (a) 1400 (b) 1300 (c) 1600 (d) 1500
  17. 17.Which is closest to 595 + 302 + 700? (a) 1800 (b) 1500 (c) 1600 (d) 1700
  18. 18.Round 15827 to the nearest thousand.
  19. 19.Which is closest to 899 + 203 + 405? (a) 1600 (b) 1700 (c) 1500 (d) 1400
  20. 20.Which is closest to 404 × 70? (Round each number first.) (a) 2800 (b) 280000 (c) 56000 (d) 28000
  21. 21.Which is closest to 1005 ÷ 49? (a) 200 (b) 10 (c) 20 (d) 40
  22. 22.Round 66.82 to one decimal place. =
  23. 23.Round 13966 to the nearest hundred.
  24. 24.Which is closest to 897 + 898 + 104? (a) 2100 (b) 1800 (c) 1900 (d) 2000
  25. 25.Which is closest to 198 × 59? (Round each number first.) (a) 1200 (b) 24000 (c) 12000 (d) 120000
  26. 26.Which is closest to 905 + 501 + 502? (a) 1800 (b) 2100 (c) 1900 (d) 2000
  27. 27.Which is closest to 196 × 29? (Round each number first.) (a) 60000 (b) 12000 (c) 600 (d) 6000
  28. 28.Round 75387 to the nearest hundred.
  29. 29.Which is closest to 705 + 199 + 703? (a) 1700 (b) 1800 (c) 1500 (d) 1600
  30. 30.Which is closest to 602 + 104 + 199? (a) 1100 (b) 1000 (c) 800 (d) 900
  31. 31.Which is closest to 204 + 497 + 905? (a) 1800 (b) 1500 (c) 1600 (d) 1700
  32. 32.Which is closest to 204 + 895 + 197? (a) 1300 (b) 1200 (c) 1500 (d) 1400
  33. 33.Which is closest to 798 × 69? (Round each number first.) (a) 56000 (b) 560000 (c) 5600 (d) 112000
  34. 34.Which is closest to 296 × 80? (Round each number first.) (a) 240000 (b) 24000 (c) 2400 (d) 48000
  35. 35.Round 38.11 to one decimal place. =
  36. 36.Which is closest to 202 × 78? (Round each number first.) (a) 32000 (b) 1600 (c) 16000 (d) 160000
  37. 37.Which is closest to 704 + 305 + 200? (a) 1200 (b) 1400 (c) 1300 (d) 1100
  38. 38.Which is closest to 500 × 88? (Round each number first.) (a) 90000 (b) 45000 (c) 450000 (d) 4500
  39. 39.Round 95911 to the nearest hundred.
  40. 40.Which is closest to 904 × 58? (Round each number first.) (a) 540000 (b) 54000 (c) 108000 (d) 5400

Answer key

  1. 8000
  2. 82.9
  3. 29.7
  4. 24.6
  5. 20000
  6. 86.4
  7. 29000
  8. 54.2
  9. 15000
  10. 30
  11. 1200
  12. 50
  13. 30000
  14. 94100
  15. 2100
  16. 1400
  17. 1600
  18. 16000
  19. 1500
  20. 28000
  21. 20
  22. 66.8
  23. 14000
  24. 1900
  25. 12000
  26. 1900
  27. 6000
  28. 75400
  29. 1600
  30. 900
  31. 1600
  32. 1300
  33. 56000
  34. 24000
  35. 38.1
  36. 16000
  37. 1200
  38. 45000
  39. 95900
  40. 54000

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