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Example 4-4b Objective Add and subtract fractions with unlike denominators

Example 4-4b Review Vocabulary Least common denominator (LCD) The LCM of the denominators of two or more fractions

Lesson 4 Contents Example 1Add Unlike Fractions Example 2Subtract Unlike Fractions Example 3Use Fractions to Solve a Problem Example 4Evaluate an Expression with Fractions

Example 4-1a Write problem Find Answer: With different denominators, use calculator 1/4 Enter numerator 3 3 Enter fraction key a b/c Enter denominator 4 Enter addition sign + + Enter numerator 1 Enter fraction key a b/c Enter denominator 5 Enter = =

Example 4-1b Answer: Find 1/4

Example 4-2a Find Write problem With different denominators, use calculator 2/4 Enter numerator 3 3 Enter fraction key a b/c Enter denominator Enter subtraction sign - - Enter numerator Enter fraction key a b/c Enter denominator Enter = = Answer:

Example 4-2b Answer: Find 2/4

Example 4-3a PET ADOPTION Use the table to find the fraction of adopted dogs in one town that are either golden retrievers or mixed breed. Fraction Mixed breed Jack Russell terrier Golden retriever German shepherd Breed Adopted Dogs Poodle Determine process 3/4 either golden retrievers or mixed breed “either/or” refers to addition Write problem Use calculator Add dimensional analysis Either golden retriever or mixed breed Answer:

Example 4-3c ICE CREAM Use the table to find the fraction of the orders that are for either vanilla or chocolate ice cream. Vanilla Strawberry Cookie dough Chocolate chip Chocolate FractionFlavor Ice Cream Orders Answer: 3/4 Either vanilla or chocolate ice cream

Example 4-4a ALGEBRA Evaluate and Write problem p - q With different denominators, use calculator 4/4 Replace p with Replace q with Answer:

Example 4-4b Answer: ALGEBRA Evaluate and * 4/4

End of Lesson 4 Assignment Lesson 6:4Adding and Subtracting Fractions All with Unlike Denominators