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10-5 Addition and Subtraction: Unlike Denominators Standard 13.0: Add and subtract rational expressions.

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Least Common Multiple Rule a. Factor each expression. b. Form the product using each factor the greatest number of times it occurs.

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#1 Finding the LCM

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#2 Finding the LCM

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Adding and Subtracting Rules: Unlike Denominators a. Change Subtraction to Add the Opposite b. Factor the Denominator, if possible c. Find a Common Denominator (LCD) d. Multiply the Numerator and Denominator by the missing factor e. Add the Numerator f. Factor the Numerator if possible g. Simplify if possible

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Fraction Rule (Addition and Subtraction) 3. 4.

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#5 Add or subtract. Simplify

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#6 Add or subtract. Simplify

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#7 Add or subtract. Simplify

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#8 Add or subtract. Simplify

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Add or Subtract. Simplify.

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