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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 17 · 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 1998 ÷ 39? (a) 50 (b) 500 (c) 100 (d) 25
  2. 2.Which is closest to 600 ÷ 31? (a) 20 (b) 40 (c) 10 (d) 200
  3. 3.Round 97.43 to one decimal place. =
  4. 4.Which is closest to 200 × 22? (Round each number first.) (a) 400 (b) 8000 (c) 40000 (d) 4000
  5. 5.Which is closest to 896 × 39? (Round each number first.) (a) 72000 (b) 360000 (c) 36000 (d) 3600
  6. 6.Round 92153 to the nearest thousand.
  7. 7.Which is closest to 3205 ÷ 39? (a) 80 (b) 160 (c) 800 (d) 40
  8. 8.Which is closest to 1806 ÷ 19? (a) 900 (b) 90 (c) 45 (d) 180
  9. 9.Round 80.07 to one decimal place. =
  10. 10.Round 9706 to the nearest hundred.
  11. 11.Round 16.66 to one decimal place. =
  12. 12.Round 7869 to the nearest ten.
  13. 13.Round 53.78 to one decimal place. =
  14. 14.Which is closest to 604 × 19? (Round each number first.) (a) 120000 (b) 1200 (c) 24000 (d) 12000
  15. 15.Which is closest to 296 × 28? (Round each number first.) (a) 18000 (b) 9000 (c) 900 (d) 90000
  16. 16.Which is closest to 200 × 18? (Round each number first.) (a) 40000 (b) 400 (c) 8000 (d) 4000
  17. 17.Which is closest to 2094 ÷ 31? (a) 140 (b) 70 (c) 700 (d) 35
  18. 18.Which is closest to 501 × 69? (Round each number first.) (a) 3500 (b) 350000 (c) 35000 (d) 70000
  19. 19.Which is closest to 699 + 595 + 497? (a) 1800 (b) 1700 (c) 1900 (d) 2000
  20. 20.Round 27533 to the nearest ten.
  21. 21.Which is closest to 2096 ÷ 31? (a) 700 (b) 70 (c) 35 (d) 140
  22. 22.Round 97.78 to one decimal place. =
  23. 23.Which is closest to 403 × 51? (Round each number first.) (a) 40000 (b) 2000 (c) 200000 (d) 20000
  24. 24.Which is closest to 200 × 39? (Round each number first.) (a) 80000 (b) 16000 (c) 8000 (d) 800
  25. 25.Round 46404 to the nearest ten.
  26. 26.Round 33.77 to one decimal place. =
  27. 27.Which is closest to 602 × 62? (Round each number first.) (a) 72000 (b) 36000 (c) 360000 (d) 3600
  28. 28.Which is closest to 1200 ÷ 31? (a) 400 (b) 20 (c) 80 (d) 40
  29. 29.Which is closest to 399 × 48? (Round each number first.) (a) 40000 (b) 20000 (c) 200000 (d) 2000
  30. 30.Which is closest to 1206 ÷ 21? (a) 60 (b) 30 (c) 120 (d) 600
  31. 31.Round 36.51 to one decimal place. =
  32. 32.Which is closest to 1198 ÷ 21? (a) 600 (b) 120 (c) 60 (d) 30
  33. 33.Which is closest to 503 × 38? (Round each number first.) (a) 200000 (b) 20000 (c) 2000 (d) 40000
  34. 34.Which is closest to 900 × 48? (Round each number first.) (a) 450000 (b) 90000 (c) 4500 (d) 45000
  35. 35.Which is closest to 2797 ÷ 39? (a) 70 (b) 140 (c) 700 (d) 35
  36. 36.Which is closest to 199 + 296 + 203? (a) 700 (b) 600 (c) 800 (d) 900
  37. 37.Which is closest to 196 × 29? (Round each number first.) (a) 12000 (b) 60000 (c) 600 (d) 6000
  38. 38.Which is closest to 696 × 52? (Round each number first.) (a) 350000 (b) 35000 (c) 70000 (d) 3500
  39. 39.Which is closest to 1207 ÷ 31? (a) 80 (b) 400 (c) 40 (d) 20
  40. 40.Which is closest to 395 + 597 + 401? (a) 1300 (b) 1600 (c) 1400 (d) 1500

Answer key

  1. 50
  2. 20
  3. 97.4
  4. 4000
  5. 36000
  6. 92000
  7. 80
  8. 90
  9. 80.1
  10. 9700
  11. 16.7
  12. 7870
  13. 53.8
  14. 12000
  15. 9000
  16. 4000
  17. 70
  18. 35000
  19. 1800
  20. 27530
  21. 70
  22. 97.8
  23. 20000
  24. 8000
  25. 46400
  26. 33.8
  27. 36000
  28. 40
  29. 20000
  30. 60
  31. 36.5
  32. 60
  33. 20000
  34. 45000
  35. 70
  36. 700
  37. 6000
  38. 35000
  39. 40
  40. 1400

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