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Published byRafe Higgins Modified over 9 years ago

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We will use addition or subtraction to solve problems involving fractions and mixed numbers. I will subtract a problem involving fractions and mixed numbers.

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Review - Adding and Subtracting Fractions with Like Denominators To add or subtract fractions with like denominators, add or subtract the numerators and write the result over the denominator. Simplify the fraction. 1515 3535 + 4545 = The denominator always stays the same.

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There are 2 ways to add or subtract fractions with unlike denominators.

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1:+ or – using LCM

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2. + or – by multiplying by denominator. http://www.flocabulary.com/adding-fractions/ 1.Multiply each fraction – Numerator and denominator by the denominator of the opposite fraction. 2.Rename the fractions 3.Add ‘em up or subtract 4.Simplify

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Step 1: Find the least common denominator (LCD) of the fractions. 13 - 6 3 4 = = 9 12 2 1 6

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13 2 - 6 9 12 Step 2:Re-name Fractions: Can you take 9 away from 2 ?

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13= 12 + 1 12 Step 3: How do I borrow?: 1= 12+ 12 2 + 14 12

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14 - 6 9 12 Now Subtract: 6 5 12

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