Adding and Subtracting Fraction Notes 10/15/09 Ex: 1/8 + 3/8 If the denominators are the same, add or subtract the numerators only. 1 + 3 8 Simplify.

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Presentation transcript:

Adding and Subtracting Fraction Notes 10/15/09 Ex: 1/8 + 3/8 If the denominators are the same, add or subtract the numerators only. 1 + 3 8 Simplify if possible. 4 = __ 8

When you have different denominators: Ex: 7/8 - 1/2 Find the LCD for both denominators. The LCD of 8 and 2 is ___. Write equivalent fractions using the LCD. 7 = __ 1 = __ 8 8 2 8 Add or subtract. Write answer in simplest form. 7 - 4 = __ 8 8 8

For lunch, 1/5 of the students chose salads, 2/5 of the students chose hamburgers, and 1/5 of the students chose cheeseburgers. What fraction of the students brought their lunch from home?