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

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

#1 Finding the LCM

#2 Finding the LCM

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

Fraction Rule (Addition and Subtraction) 3. 4.

#5 Add or subtract. Simplify

#6 Add or subtract. Simplify

#7 Add or subtract. Simplify

#8 Add or subtract. Simplify

Add or Subtract. Simplify.      