2 24 Adding & Subtracting Fractions With Unlike Denominators

Adding & Subtracting Fractions with unlike denominators 12/8/09 EQ: How do I add & subtract fractions when the denominator is different? 12/8/2009 1 Bitsy Griffin Lessons 2-24 & 25

Review: How do you add fractions with the same denominator? 12/8/2009 2 Bitsy Griffin Lessons 2-24 & 25

Problem 1: Eleni ate ¼ box of cereal. Freddie ate 3/8 box of the same box of cereal. 12/8/2009 3 Bitsy Griffin Lessons 2-24 & 25

Problem 1: What portion of the box did they eat in all? 12/8/2009 4 Bitsy Griffin Lessons 2-24 & 25

Problem 1: What needs to happen to add these 2 fractions? Need same denominator. 12/8/2009 5 Bitsy Griffin Lessons 2-24 & 25

Problem 1: Need same denominator. Least Common Denominator LCD 12/8/2009 6 Bitsy Griffin Lessons 2-24 & 25

Problem 1: How can we get the same denominator? ¼ = 2/8 12/8/2009 7 Bitsy Griffin Lessons 2-24 & 25

Problem 1: 2/8 + 3/8 = 5/8 Can it be simplified? 12/8/2009 8 Bitsy Griffin Lessons 2-24 & 25

Problem 1: How much more did Freddie eat? 3/8 - 2/8 = 1/8 Can it be simplified? 12/8/2009 9 Bitsy Griffin Lessons 2-24 & 25

Problem 2: How would we solve: ¼ + 2/3 Common denominator is? 12 12/8/2009 10 Bitsy Griffin Lessons 2-24 & 25

Problem 2: ¼ = ?/12 3/12 2/3 = ?/12 8/12 12/8/2009 11 Bitsy Griffin Lessons 2-24 & 25

Problem 3: Rosa bought 4/6 yd of copper pipe. She used ½ yd to repair the shower. 12/8/2009 14 Bitsy Griffin Lessons 2-24 & 25

Problem 3: How much pipe does she have left? Set up problem. 12/8/2009 15 Bitsy Griffin Lessons 2-24 & 25

Problem 3: 4/6 – ½ = What do we need to do? 12/8/2009 16 Bitsy Griffin Lessons 2-24 & 25

Problem 3: ½ = ?/6 3/6 4/6 – 3/6 = 1/6 Can it be simplified? 12/8/2009 17 Bitsy Griffin Lessons 2-24 & 25

Problem 3: ¾ - 1/3 = What is the LCD? 12 12/8/2009 18 Bitsy Griffin Lessons 2-24 & 25

Problem 3: ¾ = ?/12 9/12 1/3 = ?/12 4/12 12/8/2009 19 Bitsy Griffin Lessons 2-24 & 25

Problem 3: 9/12 - 4/12= 5/12 Can it be simplified? 12/8/2009 20 Bitsy Griffin Lessons 2-24 & 25

EQ: How do I add & subtract fractions when the denominator is different? 12/8/2009 21 Bitsy Griffin Lessons 2-24 & 25

2 24 Adding & Subtracting Fractions With Unlike Denominators

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2 24 Adding & Subtracting Fractions With Unlike Denominators