2 23 Adding & Subtracting Fractions With Like Denominators

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2 23 Adding & Subtracting Fractions With Like Denominators

  1. 1. Adding & Subtracting Fractions with like denominators<br />12/7/09<br />EQ: How do I add & subtract fractions with the same denominator?<br />12/6/2009<br />1<br />Bitsy Griffin Lesson 2-23<br />
  2. 2. Review:<br />Whole Number<br />12/6/2009<br />2<br />Bitsy Griffin Lesson 2-23<br />
  3. 3. Review:<br />Decimal<br />0.5<br />3.4678<br />Part of a whole<br />12/6/2009<br />3<br />Bitsy Griffin Lesson 2-23<br />
  4. 4. Review:<br />Fraction<br />¼<br />8/9<br />49/50<br />12/6/2009<br />4<br />Bitsy Griffin Lesson 2-23<br />
  5. 5. Review:<br />Mixed Number<br />8 ¼<br />6 8/9<br />50 49/50<br />12/6/2009<br />5<br />Bitsy Griffin Lesson 2-23<br />
  6. 6. Review:<br />Improper Fraction<br />8/4<br />3/2<br />90/12<br />12/6/2009<br />6<br />Bitsy Griffin Lesson 2-23<br />
  7. 7. Review:<br />What is the relationship between a mixed number and an improper fraction?<br />12/6/2009<br />7<br />Bitsy Griffin Lesson 2-23<br />
  8. 8. Review:<br />How can you change back and forth between the two?<br />12/6/2009<br />8<br />Bitsy Griffin Lesson 2-23<br />
  9. 9. Review:<br />How can you change back and forth between the two?<br />12/6/2009<br />9<br />Bitsy Griffin Lesson 2-23<br />
  10. 10. Review:<br />10/4<br />22/10<br />18/5<br />14/6<br />12/6/2009<br />10<br />Bitsy Griffin Lesson 2-23<br /><ul><li>2 2/4
  11. 11. 2 2/10
  12. 12. 3 1/5
  13. 13. 2 2/6
  14. 14. 2 1/2
  15. 15. 2 1/5
  16. 16. 3 1/5
  17. 17. 2 1/3</li></li></ul><li>Review:<br />10/4<br />22/10<br />18/5<br />14/6<br />12/6/2009<br />11<br />Bitsy Griffin Lesson 2-23<br /><ul><li>2 2/4
  18. 18. 2 2/10
  19. 19. 3 1/5
  20. 20. 2 2/6</li></li></ul><li>Problem 1: <br />Mel ran 1/6 mile on a road near his cabin.<br />Then he ran 4/6 of a mile on a trail to the lake.<br />12/6/2009<br />12<br />Bitsy Griffin Lesson 2-23<br />
  21. 21. Problem 1: <br />12/6/2009<br />13<br />Bitsy Griffin Lesson 2-23<br />1/6 1/6 1/6 1/6 1/61/6 <br /><ul><li>How far did Mel run?
  22. 22. 5/6 of a mile</li></li></ul><li>Problem 1: <br />12/6/2009<br />14<br />Bitsy Griffin Lesson 2-23<br /><ul><li>3/6
  23. 23. 1/2</li></ul>1/6 1/6 1/6 1/6 1/61/6 <br /><ul><li>How much farther was distance on the trail than the road?</li></li></ul><li>Problem 2: <br />a.m. fraction?<br />2/8<br />p.m. fraction?<br />5/8<br />12/6/2009<br />15<br />Bitsy Griffin Lesson 2-23<br />
  24. 24. Problem 2: <br />What total fraction of roller coasters you rode?<br />2/8 + 5/8 =<br />7/8<br />12/6/2009<br />16<br />Bitsy Griffin Lesson 2-23<br />
  25. 25. Problem 2: <br />How many more roller coasters did you ride in the afternoon?<br />5/8 – 2/8 =<br />3/8<br />12/6/2009<br />17<br />Bitsy Griffin Lesson 2-23<br />
  26. 26. Practice together:<br />9/10 + 3/10 =<br />9/10 – 3/10 =<br />Don’t forget to reduce (or simplify)!<br />12/6/2009<br />18<br />Bitsy Griffin Lesson 2-23<br /><ul><li>13/10
  27. 27. 6/10
  28. 28. 3/5</li></li></ul><li>Practice together:<br />¼ + ¼ =<br />5/6 – 3/6 =<br />6/9 + 2/9 =<br />12/6/2009<br />19<br />Bitsy Griffin Lesson 2-23<br /><ul><li>½
  29. 29. 2/6
  30. 30. 8/9
  31. 31. 1/3</li></li></ul><li>Think about it: <br />Why does ¼ + ¼ NOT equal 2/8?<br />12/6/2009<br />20<br />Bitsy Griffin Lesson 2-23<br />
  32. 32. EQ: <br />How do I add & subtract fractions with the same denominator?<br />12/6/2009<br />21<br />Bitsy Griffin Lesson 2-23<br />

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