2 24 Adding & Subtracting Fractions With Unlike Denominators

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2 24 Adding & Subtracting Fractions With Unlike Denominators

  1. 1. Adding & Subtracting Fractions with unlike denominators<br />12/8/09<br />EQ: How do I add & subtract fractions when the denominator is different? <br />12/8/2009<br />1<br />Bitsy Griffin Lessons 2-24 & 25<br />
  2. 2. Review:<br />How do you add fractions with the same denominator?<br />12/8/2009<br />2<br />Bitsy Griffin Lessons 2-24 & 25<br />
  3. 3. Problem 1:<br />Eleni ate ¼ box of cereal.<br />Freddie ate 3/8 box of the same box of cereal.<br />12/8/2009<br />3<br />Bitsy Griffin Lessons 2-24 & 25<br />
  4. 4. Problem 1:<br />What portion of the box did they eat in all?<br />12/8/2009<br />4<br />Bitsy Griffin Lessons 2-24 & 25<br />
  5. 5. Problem 1:<br />What needs to happen to add these 2 fractions?<br />Need same denominator.<br />12/8/2009<br />5<br />Bitsy Griffin Lessons 2-24 & 25<br />
  6. 6. Problem 1:<br />Need same denominator.<br />Least Common Denominator<br />LCD<br />12/8/2009<br />6<br />Bitsy Griffin Lessons 2-24 & 25<br />
  7. 7. Problem 1:<br />How can we get the same denominator?<br />¼ =<br />2/8<br />12/8/2009<br />7<br />Bitsy Griffin Lessons 2-24 & 25<br />
  8. 8. Problem 1:<br />2/8 + 3/8 = 5/8<br />Can it be simplified?<br />12/8/2009<br />8<br />Bitsy Griffin Lessons 2-24 & 25<br />
  9. 9. Problem 1:<br />How much more did Freddie eat? <br />3/8 - 2/8 = 1/8<br />Can it be simplified?<br />12/8/2009<br />9<br />Bitsy Griffin Lessons 2-24 & 25<br />
  10. 10. Problem 2:<br />How would we solve:<br />¼ + 2/3<br />Common denominator is?<br />12<br />12/8/2009<br />10<br />Bitsy Griffin Lessons 2-24 & 25<br />
  11. 11. Problem 2:<br />¼ = ?/12 <br />3/12<br />2/3 = ?/12<br />8/12<br />12/8/2009<br />11<br />Bitsy Griffin Lessons 2-24 & 25<br />
  12. 12. Problem 2:<br />3/12 + 8/12 =<br />11/12<br />Can it be simplified?<br />12/8/2009<br />12<br />Bitsy Griffin Lessons 2-24 & 25<br />
  13. 13. Problem 2:<br />3/12 + 8/12 =<br />11/12<br />Can it be simplified?<br />12/8/2009<br />13<br />Bitsy Griffin Lessons 2-24 & 25<br />
  14. 14. Problem 3:<br />Rosa bought 4/6 yd of copper pipe. <br />She used ½ yd to repair the shower. <br />12/8/2009<br />14<br />Bitsy Griffin Lessons 2-24 & 25<br />
  15. 15. Problem 3:<br />How much pipe does she have left?<br />Set up problem.<br />12/8/2009<br />15<br />Bitsy Griffin Lessons 2-24 & 25<br />
  16. 16. Problem 3:<br />4/6 – ½ =<br />What do we need to do?<br />12/8/2009<br />16<br />Bitsy Griffin Lessons 2-24 & 25<br />
  17. 17. Problem 3:<br />½ = ?/6<br />3/6<br />4/6 – 3/6 = <br />1/6<br />Can it be simplified?<br />12/8/2009<br />17<br />Bitsy Griffin Lessons 2-24 & 25<br />
  18. 18. Problem 3:<br />¾ - 1/3 =<br />What is the LCD?<br />12<br />12/8/2009<br />18<br />Bitsy Griffin Lessons 2-24 & 25<br />
  19. 19. Problem 3:<br />¾ = ?/12<br />9/12<br />1/3 = ?/12<br />4/12<br />12/8/2009<br />19<br />Bitsy Griffin Lessons 2-24 & 25<br />
  20. 20. Problem 3:<br />9/12 - 4/12=<br />5/12<br />Can it be simplified?<br />12/8/2009<br />20<br />Bitsy Griffin Lessons 2-24 & 25<br />
  21. 21. EQ:<br />How do I add & subtract fractions when the denominator is different?<br />12/8/2009<br />21<br />Bitsy Griffin Lessons 2-24 & 25<br />

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