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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 933 · 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 402 × 60? (Round each number first.) (a) 2400 (b) 24000 (c) 48000 (d) 240000
  2. 2.Round 11712 to the nearest ten.
  3. 3.Which is closest to 799 × 30? (Round each number first.) (a) 24000 (b) 2400 (c) 240000 (d) 48000
  4. 4.Which is closest to 198 × 88? (Round each number first.) (a) 18000 (b) 36000 (c) 1800 (d) 180000
  5. 5.Which is closest to 499 + 803 + 702? (a) 2200 (b) 2000 (c) 1900 (d) 2100
  6. 6.Which is closest to 197 × 91? (Round each number first.) (a) 36000 (b) 1800 (c) 180000 (d) 18000
  7. 7.Round 69.18 to one decimal place. =
  8. 8.Which is closest to 399 × 31? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  9. 9.Which is closest to 98 + 703 + 102? (a) 1000 (b) 800 (c) 900 (d) 1100
  10. 10.Round 33.49 to one decimal place. =
  11. 11.Which is closest to 197 + 703 + 696? (a) 1800 (b) 1600 (c) 1500 (d) 1700
  12. 12.Which is closest to 97 + 599 + 705? (a) 1300 (b) 1500 (c) 1600 (d) 1400
  13. 13.Round 61527 to the nearest hundred.
  14. 14.Round 59.56 to one decimal place. =
  15. 15.Which is closest to 295 + 505 + 502? (a) 1400 (b) 1500 (c) 1200 (d) 1300
  16. 16.Which is closest to 403 × 70? (Round each number first.) (a) 56000 (b) 28000 (c) 2800 (d) 280000
  17. 17.Round 86.13 to one decimal place. =
  18. 18.Which is closest to 98 + 204 + 398? (a) 600 (b) 800 (c) 700 (d) 900
  19. 19.Which is closest to 1408 ÷ 21? (a) 35 (b) 700 (c) 70 (d) 140
  20. 20.Which is closest to 3503 ÷ 51? (a) 140 (b) 70 (c) 700 (d) 35
  21. 21.Round 76.54 to one decimal place. =
  22. 22.Which is closest to 695 + 297 + 105? (a) 1000 (b) 1200 (c) 1100 (d) 1300
  23. 23.Which is closest to 505 + 704 + 97? (a) 1400 (b) 1500 (c) 1200 (d) 1300
  24. 24.Which is closest to 2392 ÷ 29? (a) 160 (b) 40 (c) 800 (d) 80
  25. 25.Which is closest to 902 + 698 + 103? (a) 1900 (b) 1700 (c) 1600 (d) 1800
  26. 26.Round 15.26 to one decimal place. =
  27. 27.Which is closest to 703 × 28? (Round each number first.) (a) 21000 (b) 42000 (c) 210000 (d) 2100
  28. 28.Which is closest to 296 × 68? (Round each number first.) (a) 2100 (b) 42000 (c) 21000 (d) 210000
  29. 29.Round 29.92 to one decimal place. =
  30. 30.Round 76766 to the nearest ten.
  31. 31.Which is closest to 601 × 51? (Round each number first.) (a) 60000 (b) 30000 (c) 3000 (d) 300000
  32. 32.Which is closest to 401 + 698 + 697? (a) 2000 (b) 1900 (c) 1800 (d) 1700
  33. 33.Which is closest to 99 + 605 + 300? (a) 1100 (b) 900 (c) 1000 (d) 1200
  34. 34.Round 51.67 to one decimal place. =
  35. 35.Round 28578 to the nearest ten.
  36. 36.Which is closest to 403 + 195 + 404? (a) 1000 (b) 1200 (c) 900 (d) 1100
  37. 37.Round 76.22 to one decimal place. =
  38. 38.Round 3131 to the nearest hundred.
  39. 39.Round 60.68 to one decimal place. =
  40. 40.Which is closest to 808 ÷ 41? (a) 10 (b) 20 (c) 40 (d) 200

Answer key

  1. 24000
  2. 11710
  3. 24000
  4. 18000
  5. 2000
  6. 18000
  7. 69.2
  8. 12000
  9. 900
  10. 33.5
  11. 1600
  12. 1400
  13. 61500
  14. 59.6
  15. 1300
  16. 28000
  17. 86.1
  18. 700
  19. 70
  20. 70
  21. 76.5
  22. 1100
  23. 1300
  24. 80
  25. 1700
  26. 15.3
  27. 21000
  28. 21000
  29. 29.9
  30. 76770
  31. 30000
  32. 1800
  33. 1000
  34. 51.7
  35. 28580
  36. 1000
  37. 76.2
  38. 3100
  39. 60.7
  40. 20

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