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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 251 · 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 47282 to the nearest ten.
  2. 2.Which is closest to 398 + 200 + 505? (a) 1100 (b) 1000 (c) 1200 (d) 1300
  3. 3.Which is closest to 495 + 397 + 203? (a) 1300 (b) 1000 (c) 1100 (d) 1200
  4. 4.Which is closest to 201 × 38? (Round each number first.) (a) 800 (b) 8000 (c) 16000 (d) 80000
  5. 5.Round 95057 to the nearest thousand.
  6. 6.Round 85775 to the nearest thousand.
  7. 7.Round 60668 to the nearest thousand.
  8. 8.Which is closest to 903 + 505 + 902? (a) 2500 (b) 2400 (c) 2300 (d) 2200
  9. 9.Which is closest to 404 × 90? (Round each number first.) (a) 3600 (b) 36000 (c) 360000 (d) 72000
  10. 10.Which is closest to 301 × 78? (Round each number first.) (a) 24000 (b) 2400 (c) 48000 (d) 240000
  11. 11.Which is closest to 402 + 695 + 903? (a) 1900 (b) 2000 (c) 2200 (d) 2100
  12. 12.Round 50.92 to one decimal place. =
  13. 13.Round 11659 to the nearest thousand.
  14. 14.Which is closest to 199 × 19? (Round each number first.) (a) 8000 (b) 40000 (c) 400 (d) 4000
  15. 15.Round 99929 to the nearest thousand.
  16. 16.Which is closest to 704 × 80? (Round each number first.) (a) 112000 (b) 5600 (c) 56000 (d) 560000
  17. 17.Which is closest to 97 + 101 + 605? (a) 700 (b) 1000 (c) 900 (d) 800
  18. 18.Round 99.88 to one decimal place. =
  19. 19.Which is closest to 909 ÷ 31? (a) 60 (b) 300 (c) 30 (d) 15
  20. 20.Round 4605 to the nearest hundred.
  21. 21.Which is closest to 495 + 896 + 95? (a) 1400 (b) 1700 (c) 1600 (d) 1500
  22. 22.Round 2502 to the nearest ten.
  23. 23.Round 27076 to the nearest hundred.
  24. 24.Round 32106 to the nearest hundred.
  25. 25.Which is closest to 499 + 202 + 801? (a) 1400 (b) 1700 (c) 1500 (d) 1600
  26. 26.Which is closest to 898 × 18? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  27. 27.Round 93.34 to one decimal place. =
  28. 28.Which is closest to 205 + 801 + 96? (a) 1100 (b) 1200 (c) 1000 (d) 1300
  29. 29.Which is closest to 703 × 39? (Round each number first.) (a) 56000 (b) 28000 (c) 280000 (d) 2800
  30. 30.Round 46608 to the nearest hundred.
  31. 31.Which is closest to 298 + 701 + 302? (a) 1400 (b) 1500 (c) 1300 (d) 1200
  32. 32.Round 18723 to the nearest thousand.
  33. 33.Round 26.66 to one decimal place. =
  34. 34.Which is closest to 199 × 59? (Round each number first.) (a) 120000 (b) 12000 (c) 24000 (d) 1200
  35. 35.Which is closest to 398 × 51? (Round each number first.) (a) 40000 (b) 200000 (c) 2000 (d) 20000
  36. 36.Which is closest to 2397 ÷ 39? (a) 600 (b) 30 (c) 120 (d) 60
  37. 37.Which is closest to 1593 ÷ 19? (a) 160 (b) 800 (c) 80 (d) 40
  38. 38.Round 20.42 to one decimal place. =
  39. 39.Which is closest to 296 + 402 + 296? (a) 1200 (b) 900 (c) 1000 (d) 1100
  40. 40.Which is closest to 96 + 296 + 103? (a) 700 (b) 400 (c) 600 (d) 500

Answer key

  1. 47280
  2. 1100
  3. 1100
  4. 8000
  5. 95000
  6. 86000
  7. 61000
  8. 2300
  9. 36000
  10. 24000
  11. 2000
  12. 50.9
  13. 12000
  14. 4000
  15. 100000
  16. 56000
  17. 800
  18. 99.9
  19. 30
  20. 4600
  21. 1500
  22. 2500
  23. 27100
  24. 32100
  25. 1500
  26. 18000
  27. 93.3
  28. 1100
  29. 28000
  30. 46600
  31. 1300
  32. 19000
  33. 26.7
  34. 12000
  35. 20000
  36. 60
  37. 80
  38. 20.4
  39. 1000
  40. 500

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