Adding and Subtracting Fractions with Common/Unlike Denominators
Published on Mar 17, 2016
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PRESENTATION OUTLINE
Background
- Before you can Add/Subtract fractions, you need to have COMMON denominators.
- This means, the bottom numbers need to be the same
- if denominators are NOT the same, you need to convert (change) the fractions so the HAVE the same denominator before adding or subtracting
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Background
- once you have common denominators, add/subtract numerators BUT LEAVE the denominator the SAME
- reduce if able/simplify
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Practice Adding/Subtracting with Common Denominators
Keep the denominator, add/subtract numerators, then reduce/simplify!
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Practice Adding/Subtracting with Common Denominators
Keep the denominator, Add/Subtract numerators, and reduce/simplify!
Photo by Sharon McCutcheon
Practice Adding/Subtracting with Common Denominators
Keep the denominator, Add/Subtract numerators, and reduce/simplify!
Photo by Sharon McCutcheon
Practice Adding/Subtracting with Common Denominators
Keep the denominator, Add/Subtract numerators, and reduce/simplify!
Photo by Sharon McCutcheon
Practice Adding/Subtracting with Common Denominators
Keep the denominator, Add/Subtract numerators, and reduce/simplify!
Photo by Sharon McCutcheon
Using the "fishy method"
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Practice Converting Common Denominators
Find A common denominator with the FISHY method.
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Practice Problem #1
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Practice Problem #2
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Practice Problem #3
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recap
what is needed BEFORE we can add/subtract fractions? EXPLAIN how YOU get there!
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Untitled Slide
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