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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 971 · 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 2801 ÷ 39? (a) 35 (b) 700 (c) 70 (d) 140
  2. 2.Round 74.16 to one decimal place. =
  3. 3.Which is closest to 299 × 20? (Round each number first.) (a) 60000 (b) 600 (c) 12000 (d) 6000
  4. 4.Which is closest to 600 × 52? (Round each number first.) (a) 300000 (b) 30000 (c) 60000 (d) 3000
  5. 5.Which is closest to 196 × 50? (Round each number first.) (a) 1000 (b) 100000 (c) 20000 (d) 10000
  6. 6.Which is closest to 2791 ÷ 39? (a) 700 (b) 70 (c) 140 (d) 35
  7. 7.Which is closest to 602 × 48? (Round each number first.) (a) 60000 (b) 3000 (c) 30000 (d) 300000
  8. 8.Round 12333 to the nearest thousand.
  9. 9.Round 71.64 to one decimal place. =
  10. 10.Which is closest to 1505 ÷ 51? (a) 60 (b) 15 (c) 30 (d) 300
  11. 11.Which is closest to 2795 ÷ 41? (a) 140 (b) 35 (c) 70 (d) 700
  12. 12.Round 79859 to the nearest hundred.
  13. 13.Which is closest to 299 × 72? (Round each number first.) (a) 42000 (b) 2100 (c) 210000 (d) 21000
  14. 14.Round 82.64 to one decimal place. =
  15. 15.Which is closest to 498 + 397 + 898? (a) 1800 (b) 1900 (c) 1700 (d) 2000
  16. 16.Which is closest to 1408 ÷ 19? (a) 35 (b) 140 (c) 70 (d) 700
  17. 17.Round 73.74 to one decimal place. =
  18. 18.Which is closest to 903 + 395 + 495? (a) 1900 (b) 1700 (c) 1800 (d) 2000
  19. 19.Which is closest to 793 ÷ 21? (a) 80 (b) 20 (c) 40 (d) 400
  20. 20.Which is closest to 896 × 60? (Round each number first.) (a) 54000 (b) 5400 (c) 540000 (d) 108000
  21. 21.Round 64142 to the nearest ten.
  22. 22.Which is closest to 500 × 39? (Round each number first.) (a) 40000 (b) 20000 (c) 200000 (d) 2000
  23. 23.Round 52.49 to one decimal place. =
  24. 24.Which is closest to 796 + 595 + 301? (a) 1800 (b) 1700 (c) 1900 (d) 1600
  25. 25.Which is closest to 2405 ÷ 31? (a) 80 (b) 160 (c) 800 (d) 40
  26. 26.Which is closest to 1607 ÷ 21? (a) 800 (b) 80 (c) 160 (d) 40
  27. 27.Round 21.21 to one decimal place. =
  28. 28.Which is closest to 704 + 597 + 96? (a) 1600 (b) 1500 (c) 1300 (d) 1400
  29. 29.Which is closest to 1001 ÷ 49? (a) 20 (b) 10 (c) 40 (d) 200
  30. 30.Round 52747 to the nearest thousand.
  31. 31.Round 83.56 to one decimal place. =
  32. 32.Round 22731 to the nearest thousand.
  33. 33.Round 32569 to the nearest hundred.
  34. 34.Round 91.72 to one decimal place. =
  35. 35.Which is closest to 604 × 32? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  36. 36.Round 62.88 to one decimal place. =
  37. 37.Which is closest to 2406 ÷ 41? (a) 60 (b) 120 (c) 30 (d) 600
  38. 38.Which is closest to 2397 ÷ 39? (a) 600 (b) 60 (c) 30 (d) 120
  39. 39.Which is closest to 604 ÷ 29? (a) 10 (b) 20 (c) 40 (d) 200
  40. 40.Which is closest to 2103 ÷ 31? (a) 140 (b) 35 (c) 700 (d) 70

Answer key

  1. 70
  2. 74.2
  3. 6000
  4. 30000
  5. 10000
  6. 70
  7. 30000
  8. 12000
  9. 71.6
  10. 30
  11. 70
  12. 79900
  13. 21000
  14. 82.6
  15. 1800
  16. 70
  17. 73.7
  18. 1800
  19. 40
  20. 54000
  21. 64140
  22. 20000
  23. 52.5
  24. 1700
  25. 80
  26. 80
  27. 21.2
  28. 1400
  29. 20
  30. 53000
  31. 83.6
  32. 23000
  33. 32600
  34. 91.7
  35. 18000
  36. 62.9
  37. 60
  38. 60
  39. 20
  40. 70

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