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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 349 · 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 897 ÷ 29? (a) 60 (b) 15 (c) 30 (d) 300
  2. 2.Round 54878 to the nearest hundred.
  3. 3.Which is closest to 603 × 52? (Round each number first.) (a) 60000 (b) 3000 (c) 300000 (d) 30000
  4. 4.Round 22.12 to one decimal place. =
  5. 5.Round 48.07 to one decimal place. =
  6. 6.Which is closest to 4004 ÷ 49? (a) 80 (b) 40 (c) 800 (d) 160
  7. 7.Which is closest to 893 ÷ 31? (a) 300 (b) 15 (c) 30 (d) 60
  8. 8.Round 6181 to the nearest hundred.
  9. 9.Which is closest to 304 × 49? (Round each number first.) (a) 1500 (b) 30000 (c) 15000 (d) 150000
  10. 10.Which is closest to 594 ÷ 31? (a) 200 (b) 10 (c) 20 (d) 40
  11. 11.Which is closest to 409 ÷ 19? (a) 40 (b) 200 (c) 10 (d) 20
  12. 12.Which is closest to 103 + 299 + 202? (a) 700 (b) 800 (c) 500 (d) 600
  13. 13.Round 83751 to the nearest hundred.
  14. 14.Which is closest to 800 + 903 + 400? (a) 2100 (b) 2000 (c) 2200 (d) 2300
  15. 15.Round 51826 to the nearest thousand.
  16. 16.Which is closest to 499 × 30? (Round each number first.) (a) 30000 (b) 15000 (c) 1500 (d) 150000
  17. 17.Which is closest to 2095 ÷ 29? (a) 140 (b) 35 (c) 700 (d) 70
  18. 18.Round 43327 to the nearest thousand.
  19. 19.Which is closest to 297 + 405 + 897? (a) 1500 (b) 1600 (c) 1800 (d) 1700
  20. 20.Which is closest to 2005 ÷ 51? (a) 40 (b) 400 (c) 20 (d) 80
  21. 21.Round 88838 to the nearest thousand.
  22. 22.Which is closest to 902 × 60? (Round each number first.) (a) 5400 (b) 54000 (c) 108000 (d) 540000
  23. 23.Which is closest to 697 × 79? (Round each number first.) (a) 112000 (b) 560000 (c) 56000 (d) 5600
  24. 24.Which is closest to 1505 ÷ 49? (a) 300 (b) 60 (c) 30 (d) 15
  25. 25.Round 40.82 to one decimal place. =
  26. 26.Which is closest to 803 ÷ 39? (a) 20 (b) 10 (c) 40 (d) 200
  27. 27.Which is closest to 503 + 195 + 696? (a) 1600 (b) 1400 (c) 1500 (d) 1300
  28. 28.Which is closest to 796 × 81? (Round each number first.) (a) 6400 (b) 640000 (c) 64000 (d) 128000
  29. 29.Which is closest to 298 × 20? (Round each number first.) (a) 60000 (b) 6000 (c) 600 (d) 12000
  30. 30.Round 27.06 to one decimal place. =
  31. 31.Round 9043 to the nearest hundred.
  32. 32.Which is closest to 299 × 52? (Round each number first.) (a) 1500 (b) 30000 (c) 15000 (d) 150000
  33. 33.Round 95254 to the nearest ten.
  34. 34.Which is closest to 604 + 205 + 305? (a) 1200 (b) 1000 (c) 1300 (d) 1100
  35. 35.Round 15.21 to one decimal place. =
  36. 36.Which is closest to 601 × 88? (Round each number first.) (a) 5400 (b) 540000 (c) 108000 (d) 54000
  37. 37.Round 39.68 to one decimal place. =
  38. 38.Which is closest to 500 + 103 + 595? (a) 1200 (b) 1100 (c) 1400 (d) 1300
  39. 39.Which is closest to 2409 ÷ 29? (a) 160 (b) 800 (c) 80 (d) 40
  40. 40.Which is closest to 900 + 599 + 696? (a) 2100 (b) 2400 (c) 2300 (d) 2200

Answer key

  1. 30
  2. 54900
  3. 30000
  4. 22.1
  5. 48.1
  6. 80
  7. 30
  8. 6200
  9. 15000
  10. 20
  11. 20
  12. 600
  13. 83800
  14. 2100
  15. 52000
  16. 15000
  17. 70
  18. 43000
  19. 1600
  20. 40
  21. 89000
  22. 54000
  23. 56000
  24. 30
  25. 40.8
  26. 20
  27. 1400
  28. 64000
  29. 6000
  30. 27.1
  31. 9000
  32. 15000
  33. 95250
  34. 1100
  35. 15.2
  36. 54000
  37. 39.7
  38. 1200
  39. 80
  40. 2200

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