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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 479 · 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 497 × 51? (Round each number first.) (a) 2500 (b) 25000 (c) 50000 (d) 250000
  2. 2.Which is closest to 197 + 701 + 104? (a) 900 (b) 1100 (c) 1200 (d) 1000
  3. 3.Round 65316 to the nearest hundred.
  4. 4.Which is closest to 1801 ÷ 19? (a) 900 (b) 180 (c) 45 (d) 90
  5. 5.Which is closest to 1598 ÷ 21? (a) 80 (b) 40 (c) 800 (d) 160
  6. 6.Which is closest to 799 × 78? (Round each number first.) (a) 64000 (b) 6400 (c) 640000 (d) 128000
  7. 7.Which is closest to 503 + 195 + 305? (a) 1100 (b) 900 (c) 1000 (d) 1200
  8. 8.Round 68.51 to one decimal place. =
  9. 9.Which is closest to 197 + 205 + 202? (a) 500 (b) 700 (c) 800 (d) 600
  10. 10.Which is closest to 1594 ÷ 21? (a) 800 (b) 40 (c) 160 (d) 80
  11. 11.Round 50539 to the nearest hundred.
  12. 12.Round 48.92 to one decimal place. =
  13. 13.Round 67.09 to one decimal place. =
  14. 14.Which is closest to 701 × 21? (Round each number first.) (a) 140000 (b) 1400 (c) 28000 (d) 14000
  15. 15.Round 88329 to the nearest hundred.
  16. 16.Which is closest to 699 × 40? (Round each number first.) (a) 56000 (b) 280000 (c) 28000 (d) 2800
  17. 17.Round 33.81 to one decimal place. =
  18. 18.Round 3931 to the nearest thousand.
  19. 19.Which is closest to 400 + 796 + 803? (a) 2200 (b) 1900 (c) 2100 (d) 2000
  20. 20.Which is closest to 1503 ÷ 49? (a) 30 (b) 60 (c) 300 (d) 15
  21. 21.Which is closest to 3603 ÷ 39? (a) 90 (b) 180 (c) 45 (d) 900
  22. 22.Round 70259 to the nearest thousand.
  23. 23.Which is closest to 803 × 19? (Round each number first.) (a) 32000 (b) 16000 (c) 160000 (d) 1600
  24. 24.Round 54.66 to one decimal place. =
  25. 25.Which is closest to 1597 ÷ 41? (a) 80 (b) 20 (c) 40 (d) 400
  26. 26.Round 79.59 to one decimal place. =
  27. 27.Round 38188 to the nearest ten.
  28. 28.Which is closest to 397 × 41? (Round each number first.) (a) 1600 (b) 32000 (c) 16000 (d) 160000
  29. 29.Round 5921 to the nearest thousand.
  30. 30.Which is closest to 697 × 88? (Round each number first.) (a) 126000 (b) 630000 (c) 63000 (d) 6300
  31. 31.Which is closest to 797 + 295 + 898? (a) 1900 (b) 2100 (c) 2200 (d) 2000
  32. 32.Round 10.29 to one decimal place. =
  33. 33.Round 25008 to the nearest ten.
  34. 34.Which is closest to 303 × 29? (Round each number first.) (a) 900 (b) 90000 (c) 9000 (d) 18000
  35. 35.Round 10.33 to one decimal place. =
  36. 36.Round 49.68 to one decimal place. =
  37. 37.Round 92606 to the nearest ten.
  38. 38.Round 85350 to the nearest thousand.
  39. 39.Round 69.28 to one decimal place. =
  40. 40.Which is closest to 101 + 95 + 796? (a) 1100 (b) 900 (c) 1000 (d) 1200

Answer key

  1. 25000
  2. 1000
  3. 65300
  4. 90
  5. 80
  6. 64000
  7. 1000
  8. 68.5
  9. 600
  10. 80
  11. 50500
  12. 48.9
  13. 67.1
  14. 14000
  15. 88300
  16. 28000
  17. 33.8
  18. 4000
  19. 2000
  20. 30
  21. 90
  22. 70000
  23. 16000
  24. 54.7
  25. 40
  26. 79.6
  27. 38190
  28. 16000
  29. 6000
  30. 63000
  31. 2000
  32. 10.3
  33. 25010
  34. 9000
  35. 10.3
  36. 49.7
  37. 92610
  38. 85000
  39. 69.3
  40. 1000

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