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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 998 · 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 71.66 to one decimal place. =
  2. 2.Which is closest to 1392 ÷ 19? (a) 140 (b) 70 (c) 35 (d) 700
  3. 3.Which is closest to 195 + 295 + 897? (a) 1300 (b) 1600 (c) 1400 (d) 1500
  4. 4.Round 25.21 to one decimal place. =
  5. 5.Which is closest to 695 + 702 + 897? (a) 2500 (b) 2300 (c) 2200 (d) 2400
  6. 6.Which is closest to 1503 ÷ 29? (a) 25 (b) 100 (c) 50 (d) 500
  7. 7.Which is closest to 102 + 795 + 299? (a) 1300 (b) 1400 (c) 1200 (d) 1100
  8. 8.Which is closest to 2801 ÷ 39? (a) 700 (b) 70 (c) 35 (d) 140
  9. 9.Round 66869 to the nearest hundred.
  10. 10.Which is closest to 201 × 29? (Round each number first.) (a) 60000 (b) 12000 (c) 600 (d) 6000
  11. 11.Round 23003 to the nearest ten.
  12. 12.Round 76271 to the nearest hundred.
  13. 13.Which is closest to 398 × 71? (Round each number first.) (a) 2800 (b) 28000 (c) 280000 (d) 56000
  14. 14.Which is closest to 196 × 28? (Round each number first.) (a) 6000 (b) 60000 (c) 600 (d) 12000
  15. 15.Round 87383 to the nearest ten.
  16. 16.Round 65148 to the nearest ten.
  17. 17.Round 39359 to the nearest thousand.
  18. 18.Round 50548 to the nearest hundred.
  19. 19.Which is closest to 504 + 203 + 803? (a) 1700 (b) 1500 (c) 1600 (d) 1400
  20. 20.Round 32195 to the nearest thousand.
  21. 21.Which is closest to 302 + 98 + 895? (a) 1500 (b) 1300 (c) 1200 (d) 1400
  22. 22.Round 38.41 to one decimal place. =
  23. 23.Which is closest to 399 + 698 + 196? (a) 1500 (b) 1400 (c) 1200 (d) 1300
  24. 24.Which is closest to 1500 ÷ 29? (a) 25 (b) 50 (c) 100 (d) 500
  25. 25.Round 34.56 to one decimal place. =
  26. 26.Which is closest to 598 × 49? (Round each number first.) (a) 30000 (b) 300000 (c) 60000 (d) 3000
  27. 27.Which is closest to 501 + 705 + 303? (a) 1700 (b) 1500 (c) 1400 (d) 1600
  28. 28.Round 89.82 to one decimal place. =
  29. 29.Which is closest to 298 × 32? (Round each number first.) (a) 900 (b) 9000 (c) 18000 (d) 90000
  30. 30.Round 46772 to the nearest hundred.
  31. 31.Which is closest to 1497 ÷ 51? (a) 30 (b) 60 (c) 300 (d) 15
  32. 32.Which is closest to 602 + 897 + 97? (a) 1800 (b) 1600 (c) 1500 (d) 1700
  33. 33.Round 10.38 to one decimal place. =
  34. 34.Round 61833 to the nearest ten.
  35. 35.Which is closest to 299 × 60? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  36. 36.Which is closest to 503 + 97 + 605? (a) 1300 (b) 1100 (c) 1400 (d) 1200
  37. 37.Which is closest to 505 + 697 + 799? (a) 2100 (b) 2200 (c) 1900 (d) 2000
  38. 38.Round 40.79 to one decimal place. =
  39. 39.Which is closest to 196 × 70? (Round each number first.) (a) 140000 (b) 14000 (c) 1400 (d) 28000
  40. 40.Which is closest to 203 × 68? (Round each number first.) (a) 14000 (b) 1400 (c) 140000 (d) 28000

Answer key

  1. 71.7
  2. 70
  3. 1400
  4. 25.2
  5. 2300
  6. 50
  7. 1200
  8. 70
  9. 66900
  10. 6000
  11. 23000
  12. 76300
  13. 28000
  14. 6000
  15. 87380
  16. 65150
  17. 39000
  18. 50500
  19. 1500
  20. 32000
  21. 1300
  22. 38.4
  23. 1300
  24. 50
  25. 34.6
  26. 30000
  27. 1500
  28. 89.8
  29. 9000
  30. 46800
  31. 30
  32. 1600
  33. 10.4
  34. 61830
  35. 18000
  36. 1200
  37. 2000
  38. 40.8
  39. 14000
  40. 14000

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