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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 992 · 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 301 × 32? (Round each number first.) (a) 9000 (b) 90000 (c) 900 (d) 18000
  2. 2.Which is closest to 695 + 395 + 401? (a) 1600 (b) 1500 (c) 1700 (d) 1400
  3. 3.Round 53079 to the nearest thousand.
  4. 4.Round 23846 to the nearest hundred.
  5. 5.Which is closest to 904 × 50? (Round each number first.) (a) 450000 (b) 4500 (c) 90000 (d) 45000
  6. 6.Which is closest to 1797 ÷ 31? (a) 30 (b) 120 (c) 60 (d) 600
  7. 7.Round 18.94 to one decimal place. =
  8. 8.Which is closest to 297 + 599 + 697? (a) 1600 (b) 1700 (c) 1500 (d) 1800
  9. 9.Round 12.74 to one decimal place. =
  10. 10.Round 87.38 to one decimal place. =
  11. 11.Which is closest to 2705 ÷ 29? (a) 180 (b) 45 (c) 90 (d) 900
  12. 12.Which is closest to 1497 ÷ 29? (a) 100 (b) 500 (c) 25 (d) 50
  13. 13.Which is closest to 900 × 21? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
  14. 14.Which is closest to 2407 ÷ 31? (a) 800 (b) 160 (c) 40 (d) 80
  15. 15.Round 74.74 to one decimal place. =
  16. 16.Which is closest to 399 + 900 + 704? (a) 2100 (b) 2200 (c) 2000 (d) 1900
  17. 17.Round 65572 to the nearest ten.
  18. 18.Which is closest to 1592 ÷ 41? (a) 80 (b) 20 (c) 40 (d) 400
  19. 19.Round 34437 to the nearest hundred.
  20. 20.Round 47309 to the nearest thousand.
  21. 21.Round 94.43 to one decimal place. =
  22. 22.Which is closest to 203 + 203 + 296? (a) 800 (b) 700 (c) 900 (d) 600
  23. 23.Which is closest to 598 × 22? (Round each number first.) (a) 24000 (b) 1200 (c) 12000 (d) 120000
  24. 24.Which is closest to 2706 ÷ 29? (a) 180 (b) 45 (c) 900 (d) 90
  25. 25.Which is closest to 703 × 18? (Round each number first.) (a) 28000 (b) 140000 (c) 14000 (d) 1400
  26. 26.Which is closest to 793 ÷ 19? (a) 20 (b) 400 (c) 40 (d) 80
  27. 27.Round 84033 to the nearest hundred.
  28. 28.Round 99142 to the nearest ten.
  29. 29.Round 21862 to the nearest hundred.
  30. 30.Which is closest to 799 × 20? (Round each number first.) (a) 160000 (b) 32000 (c) 16000 (d) 1600
  31. 31.Round 31.19 to one decimal place. =
  32. 32.Which is closest to 200 + 302 + 702? (a) 1300 (b) 1100 (c) 1200 (d) 1400
  33. 33.Which is closest to 3498 ÷ 49? (a) 140 (b) 35 (c) 70 (d) 700
  34. 34.Which is closest to 696 × 39? (Round each number first.) (a) 56000 (b) 2800 (c) 280000 (d) 28000
  35. 35.Round 68316 to the nearest ten.
  36. 36.Which is closest to 298 × 41? (Round each number first.) (a) 12000 (b) 1200 (c) 24000 (d) 120000
  37. 37.Which is closest to 597 × 70? (Round each number first.) (a) 420000 (b) 42000 (c) 84000 (d) 4200
  38. 38.Which is closest to 898 × 92? (Round each number first.) (a) 81000 (b) 162000 (c) 810000 (d) 8100
  39. 39.Which is closest to 605 + 804 + 495? (a) 2000 (b) 1900 (c) 2100 (d) 1800
  40. 40.Round 43464 to the nearest hundred.

Answer key

  1. 9000
  2. 1500
  3. 53000
  4. 23800
  5. 45000
  6. 60
  7. 18.9
  8. 1600
  9. 12.7
  10. 87.4
  11. 90
  12. 50
  13. 18000
  14. 80
  15. 74.7
  16. 2000
  17. 65570
  18. 40
  19. 34400
  20. 47000
  21. 94.4
  22. 700
  23. 12000
  24. 90
  25. 14000
  26. 40
  27. 84000
  28. 99140
  29. 21900
  30. 16000
  31. 31.2
  32. 1200
  33. 70
  34. 28000
  35. 68320
  36. 12000
  37. 42000
  38. 81000
  39. 1900
  40. 43500

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