2. Add & Subtract Fractions Barbara Shephard Cobb 6 th Grade Campus GPISD

3. OBJECTIVE The student is expected to model addition and subtraction situations involving fractions with objects, pictures, words, and numbers.

4. Purpose  Student will be able to: Understand the basic fraction concepts by solving problems using models Add and subtract fractions using models to help illustrate the process 

5. Problem # 1 John has 5 ½ hours left before his school project is due. He has to work 2 ¼ hours before he can start on project. How much time does he have to work on project? 5 ½ =5 2/4 - 2 ¼ =2 ¼ 3 ¼

6. Problem #1 5 ½ = 5 2/4 - 2 ¼ =2 ¼ 3 ¼

7. Problem #2 Ms. Shorter made a cake for her son. She used a half stick of butter, 3 ½ cups of sugar, 2 ¼ cups of flour, and 6 eggs. What were the total measurement of the ingredients used to bake the cake? ½ 3 ½ 2 ½ +6 11 3/2 = 12 ½

8. Problem #2 ½ 3 ½ 2 ½ +6 11 3/2 = 12 ½  (3 divided by 2 equals 1 ½ )  ( 11 plus 1 ½ equals 12 ½ )

9. Guided Practice 4 ½ 2 2/4 10 7/10 + 7 3/8 +7 1/3 +15 2/15 17 2/4 42 2/4 32 2/6 - 12 ¼ - 10 3/12 - 5 1/6

10. Independent Practice  Go to: –www.ask.comwww.ask.com –http://illuminations.nctm.org/tools/index.as.pxhttp://illuminations.nctm.org/tools/index.as.px

11. Conclusion  From observations of mathematical fraction models, students should be able to effectively solve the addition and or subtraction of fraction.