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Fractions with Unlike Denominators - Adding and Subtracting

Learn how to add and subtract fractions with unlike denominators in this lesson. Practice problems and step-by-step examples provided.

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Fractions with Unlike Denominators - Adding and Subtracting

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  1. Transparency 4 Click the mouse button or press the Space Bar to display the answers.

  2. Splash Screen

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

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

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

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

  7. Find Answer: Example 4-1b 1/4

  8. Find Example 4-2a Write problem With different denominators, use calculator Enter numerator 3 Enter fraction key Enter denominator 5 3 5 3 3 5 1 6 3 5 1 a b/c - a b/c = Enter subtraction sign - Answer: Enter numerator 1 Enter fraction key Enter denominator 6 Enter = 2/4

  9. Find Answer: Example 4-2b 2/4

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

  11. Ice Cream Orders Flavor Fraction Chocolate Chocolatechip Cookie dough Strawberry Answer: Vanilla Example 4-3c ICE CREAMUse the table to find the fraction of the orders that are for either vanilla or chocolate ice cream. Either vanilla or chocolate ice cream 3/4

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

  13. ALGEBRAEvaluate and Answer: Example 4-4b * 4/4

  14. End of Lesson 4 Assignment

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