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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 877 · 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 29987 to the nearest hundred.
  2. 2.Round 34.28 to one decimal place. =
  3. 3.Round 86594 to the nearest ten.
  4. 4.Round 62.47 to one decimal place. =
  5. 5.Which is closest to 502 × 20? (Round each number first.) (a) 100000 (b) 20000 (c) 10000 (d) 1000
  6. 6.Round 32814 to the nearest hundred.
  7. 7.Which is closest to 197 × 91? (Round each number first.) (a) 36000 (b) 180000 (c) 1800 (d) 18000
  8. 8.Which is closest to 1207 ÷ 31? (a) 400 (b) 40 (c) 80 (d) 20
  9. 9.Which is closest to 97 + 704 + 195? (a) 1000 (b) 900 (c) 1200 (d) 1100
  10. 10.Which is closest to 702 × 22? (Round each number first.) (a) 1400 (b) 28000 (c) 140000 (d) 14000
  11. 11.Which is closest to 897 × 21? (Round each number first.) (a) 18000 (b) 180000 (c) 36000 (d) 1800
  12. 12.Which is closest to 398 + 900 + 102? (a) 1300 (b) 1500 (c) 1400 (d) 1600
  13. 13.Round 89377 to the nearest ten.
  14. 14.Which is closest to 1994 ÷ 49? (a) 400 (b) 80 (c) 40 (d) 20
  15. 15.Round 71.68 to one decimal place. =
  16. 16.Round 24.68 to one decimal place. =
  17. 17.Round 88.44 to one decimal place. =
  18. 18.Which is closest to 301 + 405 + 501? (a) 1300 (b) 1400 (c) 1100 (d) 1200
  19. 19.Round 55441 to the nearest thousand.
  20. 20.Which is closest to 202 + 398 + 198? (a) 800 (b) 700 (c) 1000 (d) 900
  21. 21.Which is closest to 1794 ÷ 29? (a) 30 (b) 600 (c) 60 (d) 120
  22. 22.Round 22448 to the nearest thousand.
  23. 23.Which is closest to 1408 ÷ 21? (a) 700 (b) 35 (c) 70 (d) 140
  24. 24.Which is closest to 204 × 32? (Round each number first.) (a) 6000 (b) 60000 (c) 600 (d) 12000
  25. 25.Which is closest to 1793 ÷ 21? (a) 45 (b) 180 (c) 900 (d) 90
  26. 26.Which is closest to 302 + 895 + 896? (a) 2100 (b) 2200 (c) 2300 (d) 2000
  27. 27.Which is closest to 1200 ÷ 39? (a) 300 (b) 15 (c) 30 (d) 60
  28. 28.Round 11.27 to one decimal place. =
  29. 29.Round 55.68 to one decimal place. =
  30. 30.Which is closest to 901 × 71? (Round each number first.) (a) 126000 (b) 63000 (c) 630000 (d) 6300
  31. 31.Round 21356 to the nearest thousand.
  32. 32.Which is closest to 805 ÷ 39? (a) 40 (b) 20 (c) 10 (d) 200
  33. 33.Which is closest to 1207 ÷ 21? (a) 120 (b) 30 (c) 600 (d) 60
  34. 34.Round 35022 to the nearest thousand.
  35. 35.Which is closest to 199 + 203 + 201? (a) 500 (b) 700 (c) 600 (d) 800
  36. 36.Which is closest to 901 × 18? (Round each number first.) (a) 18000 (b) 36000 (c) 180000 (d) 1800
  37. 37.Which is closest to 497 × 72? (Round each number first.) (a) 35000 (b) 70000 (c) 350000 (d) 3500
  38. 38.Round 17.51 to one decimal place. =
  39. 39.Round 69108 to the nearest hundred.
  40. 40.Which is closest to 1795 ÷ 19? (a) 900 (b) 45 (c) 180 (d) 90

Answer key

  1. 30000
  2. 34.3
  3. 86590
  4. 62.5
  5. 10000
  6. 32800
  7. 18000
  8. 40
  9. 1000
  10. 14000
  11. 18000
  12. 1400
  13. 89380
  14. 40
  15. 71.7
  16. 24.7
  17. 88.4
  18. 1200
  19. 55000
  20. 800
  21. 60
  22. 22000
  23. 70
  24. 6000
  25. 90
  26. 2100
  27. 30
  28. 11.3
  29. 55.7
  30. 63000
  31. 21000
  32. 20
  33. 60
  34. 35000
  35. 600
  36. 18000
  37. 35000
  38. 17.5
  39. 69100
  40. 90

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