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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 233 · 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 78.73 to one decimal place. =
  2. 2.Round 54393 to the nearest hundred.
  3. 3.Which is closest to 805 + 404 + 105? (a) 1300 (b) 1400 (c) 1200 (d) 1500
  4. 4.Round 81402 to the nearest ten.
  5. 5.Round 34.07 to one decimal place. =
  6. 6.Round 62724 to the nearest hundred.
  7. 7.Which is closest to 496 + 903 + 796? (a) 2100 (b) 2200 (c) 2300 (d) 2400
  8. 8.Round 58565 to the nearest hundred.
  9. 9.Which is closest to 601 ÷ 31? (a) 200 (b) 10 (c) 40 (d) 20
  10. 10.Which is closest to 1797 ÷ 19? (a) 45 (b) 180 (c) 900 (d) 90
  11. 11.Which is closest to 1605 ÷ 19? (a) 160 (b) 800 (c) 80 (d) 40
  12. 12.Which is closest to 1492 ÷ 49? (a) 30 (b) 300 (c) 60 (d) 15
  13. 13.Which is closest to 904 ÷ 29? (a) 30 (b) 60 (c) 15 (d) 300
  14. 14.Round 81.46 to one decimal place. =
  15. 15.Round 38.22 to one decimal place. =
  16. 16.Which is closest to 197 × 29? (Round each number first.) (a) 12000 (b) 6000 (c) 60000 (d) 600
  17. 17.Which is closest to 404 + 102 + 97? (a) 600 (b) 800 (c) 700 (d) 500
  18. 18.Which is closest to 796 + 397 + 102? (a) 1400 (b) 1500 (c) 1200 (d) 1300
  19. 19.Which is closest to 1502 ÷ 51? (a) 60 (b) 30 (c) 15 (d) 300
  20. 20.Round 21.72 to one decimal place. =
  21. 21.Which is closest to 499 × 89? (Round each number first.) (a) 450000 (b) 4500 (c) 45000 (d) 90000
  22. 22.Which is closest to 199 × 91? (Round each number first.) (a) 36000 (b) 18000 (c) 1800 (d) 180000
  23. 23.Which is closest to 808 ÷ 39? (a) 200 (b) 20 (c) 40 (d) 10
  24. 24.Round 34.12 to one decimal place. =
  25. 25.Round 67.52 to one decimal place. =
  26. 26.Which is closest to 401 × 92? (Round each number first.) (a) 72000 (b) 36000 (c) 360000 (d) 3600
  27. 27.Which is closest to 3505 ÷ 49? (a) 700 (b) 35 (c) 140 (d) 70
  28. 28.Which is closest to 2994 ÷ 51? (a) 30 (b) 60 (c) 600 (d) 120
  29. 29.Which is closest to 498 × 38? (Round each number first.) (a) 2000 (b) 40000 (c) 200000 (d) 20000
  30. 30.Which is closest to 1003 ÷ 21? (a) 50 (b) 100 (c) 25 (d) 500
  31. 31.Which is closest to 598 + 502 + 98? (a) 1200 (b) 1300 (c) 1400 (d) 1100
  32. 32.Which is closest to 1591 ÷ 21? (a) 80 (b) 40 (c) 800 (d) 160
  33. 33.Round 1107 to the nearest hundred.
  34. 34.Which is closest to 898 ÷ 31? (a) 15 (b) 300 (c) 30 (d) 60
  35. 35.Round 6986 to the nearest ten.
  36. 36.Round 51.14 to one decimal place. =
  37. 37.Which is closest to 198 + 296 + 797? (a) 1500 (b) 1200 (c) 1300 (d) 1400
  38. 38.Which is closest to 3496 ÷ 49? (a) 140 (b) 70 (c) 35 (d) 700
  39. 39.Which is closest to 204 + 204 + 203? (a) 800 (b) 700 (c) 500 (d) 600
  40. 40.Which is closest to 196 × 31? (Round each number first.) (a) 6000 (b) 600 (c) 60000 (d) 12000

Answer key

  1. 78.7
  2. 54400
  3. 1300
  4. 81400
  5. 34.1
  6. 62700
  7. 2200
  8. 58600
  9. 20
  10. 90
  11. 80
  12. 30
  13. 30
  14. 81.5
  15. 38.2
  16. 6000
  17. 600
  18. 1300
  19. 30
  20. 21.7
  21. 45000
  22. 18000
  23. 20
  24. 34.1
  25. 67.5
  26. 36000
  27. 70
  28. 60
  29. 20000
  30. 50
  31. 1200
  32. 80
  33. 1100
  34. 30
  35. 6990
  36. 51.1
  37. 1300
  38. 70
  39. 600
  40. 6000

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