10 5 addition and subtraction unlike denominators
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10-5 Addition and Subtraction: Unlike Denominators. Standard 13.0: Add and subtract rational expressions. Factor each expression. Form the product using each factor the greatest number of times it occurs. . Least Common Multiple Rule. #1 Finding the LCM. #2 Finding the LCM.

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10 5 addition and subtraction unlike denominators l.jpg

10-5Addition and Subtraction:Unlike Denominators

Standard 13.0: Add and subtract rational expressions.


Least common multiple rule l.jpg

Factor each expression.

Form the product using each factor the greatest number of times it occurs.

Least Common Multiple Rule




Adding and subtracting rules unlike denominators l.jpg
Adding and Subtracting Rules: Unlike Denominators

  • Change Subtraction to Add the Opposite

  • Factor the Denominator, if possible

  • Find a Common Denominator (LCD)

  • Multiply the Numerator and Denominator by the missing factor

  • Add the Numerator

  • Factor the Numerator if possible

  • Simplify if possible








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