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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 937 · 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 499 + 199 + 197? (a) 800 (b) 1100 (c) 900 (d) 1000
  2. 2.Which is closest to 2104 ÷ 31? (a) 35 (b) 140 (c) 70 (d) 700
  3. 3.Which is closest to 303 × 40? (Round each number first.) (a) 1200 (b) 120000 (c) 24000 (d) 12000
  4. 4.Which is closest to 2399 ÷ 31? (a) 800 (b) 160 (c) 80 (d) 40
  5. 5.Round 31.76 to one decimal place. =
  6. 6.Which is closest to 899 × 49? (Round each number first.) (a) 45000 (b) 90000 (c) 4500 (d) 450000
  7. 7.Which is closest to 99 + 697 + 800? (a) 1700 (b) 1500 (c) 1800 (d) 1600
  8. 8.Which is closest to 303 × 58? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
  9. 9.Round 46828 to the nearest hundred.
  10. 10.Which is closest to 596 × 21? (Round each number first.) (a) 12000 (b) 24000 (c) 1200 (d) 120000
  11. 11.Which is closest to 796 × 18? (Round each number first.) (a) 32000 (b) 16000 (c) 160000 (d) 1600
  12. 12.Which is closest to 500 × 32? (Round each number first.) (a) 1500 (b) 30000 (c) 15000 (d) 150000
  13. 13.Round 26.74 to one decimal place. =
  14. 14.Round 12202 to the nearest thousand.
  15. 15.Round 50372 to the nearest ten.
  16. 16.Which is closest to 798 × 50? (Round each number first.) (a) 80000 (b) 4000 (c) 40000 (d) 400000
  17. 17.Round 24644 to the nearest ten.
  18. 18.Round 15300 to the nearest thousand.
  19. 19.Which is closest to 199 + 203 + 595? (a) 1100 (b) 1200 (c) 900 (d) 1000
  20. 20.Which is closest to 500 + 199 + 699? (a) 1600 (b) 1400 (c) 1300 (d) 1500
  21. 21.Round 25.87 to one decimal place. =
  22. 22.Which is closest to 403 × 29? (Round each number first.) (a) 120000 (b) 12000 (c) 1200 (d) 24000
  23. 23.Round 87572 to the nearest thousand.
  24. 24.Round 11.57 to one decimal place. =
  25. 25.Which is closest to 303 × 62? (Round each number first.) (a) 18000 (b) 36000 (c) 1800 (d) 180000
  26. 26.Which is closest to 304 + 405 + 503? (a) 1400 (b) 1100 (c) 1200 (d) 1300
  27. 27.Round 5741 to the nearest ten.
  28. 28.Which is closest to 1598 ÷ 19? (a) 800 (b) 80 (c) 160 (d) 40
  29. 29.Which is closest to 303 × 39? (Round each number first.) (a) 120000 (b) 12000 (c) 24000 (d) 1200
  30. 30.Which is closest to 698 + 296 + 204? (a) 1200 (b) 1100 (c) 1300 (d) 1400
  31. 31.Round 22175 to the nearest hundred.
  32. 32.Round 13.69 to one decimal place. =
  33. 33.Which is closest to 3594 ÷ 39? (a) 45 (b) 180 (c) 90 (d) 900
  34. 34.Which is closest to 2793 ÷ 41? (a) 140 (b) 70 (c) 700 (d) 35
  35. 35.Round 34.82 to one decimal place. =
  36. 36.Round 32.89 to one decimal place. =
  37. 37.Round 13095 to the nearest hundred.
  38. 38.Which is closest to 198 × 42? (Round each number first.) (a) 8000 (b) 800 (c) 80000 (d) 16000
  39. 39.Which is closest to 402 × 78? (Round each number first.) (a) 64000 (b) 320000 (c) 3200 (d) 32000
  40. 40.Which is closest to 504 + 201 + 895? (a) 1700 (b) 1600 (c) 1500 (d) 1800

Answer key

  1. 900
  2. 70
  3. 12000
  4. 80
  5. 31.8
  6. 45000
  7. 1600
  8. 18000
  9. 46800
  10. 12000
  11. 16000
  12. 15000
  13. 26.7
  14. 12000
  15. 50370
  16. 40000
  17. 24640
  18. 15000
  19. 1000
  20. 1400
  21. 25.9
  22. 12000
  23. 88000
  24. 11.6
  25. 18000
  26. 1200
  27. 5740
  28. 80
  29. 12000
  30. 1200
  31. 22200
  32. 13.7
  33. 90
  34. 70
  35. 34.8
  36. 32.9
  37. 13100
  38. 8000
  39. 32000
  40. 1600

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