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Adding & Subtracting Fractions with unlike Denominators PowerPoint Presentation
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Adding & Subtracting Fractions with unlike Denominators

Adding & Subtracting Fractions with unlike Denominators

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Adding & Subtracting Fractions with unlike Denominators

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  1. Adding & Subtracting Fractions with unlike Denominators

  2. Adding Fractions with Unlike denominators 1. Find the least common denominator for the 2 fractions in the problem. EX: ⅓ + ⅕ The LCD for ⅓ and ⅕ is 15. 2. Make equivalent fractions for ⅓ and ⅕ with a 15 in the denominator. EX: ⅓ = + ⅕ = 5 Now you have created a problem you can do. 15 3 15

  3. EX: ⅓ = + ⅕ = 5 15 3 15 8 Make sure your answer is in simplest form. 15 Subtracting Fractions with Unlike denominators 1. Find the least common denominator for the 2 fractions in the problem. EX. 4 5 - 1 2__ = The LCD for ⅘ and ½ is 10. =

  4. 2. Make equivalent fractions for ⅘ and ½ with a 10 in the denominator. EX. 4 5 - 1 2__ 8 10 = Now you have created a problem you can do. 5 10 = ⅘ - ½ 8 10 = 5 10 = Make sure your answer is in simplest form. 3 10

  5. Let’s practice: ⅖ ⅓ + ⅙ + ⅜ ⅚ ⅔ - ⅜ - ⅙