Adding and Subtracting Unlike Fractions 3.6. To add and subtract fractions with unlike denominators, first find a common denominator using one of these.

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Presentation transcript:

Adding and Subtracting Unlike Fractions 3.6

To add and subtract fractions with unlike denominators, first find a common denominator using one of these methods: Method 1 Find a common denominator by multiplying the two denominators. Method 2 Find the least common denominator (LCD) of the denominators. (Cake Method)

Steps Find LCD or CD Write equivalent fractions: Multiply the fraction by a value of 1 in order to get the LCD or CD Add or subtract the numerators Reduce

Write in Simplest form: LCD: 18 Rename Fractions: Add the numerators:

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Find the perimeter of the figure below. + First, work with the fractions. Then, work with the whole numbers. Last, simplify.

Vickie has cups of shredded cheese to put in her enchilada casserole and ¾ cup of cheese for the top. If she has 3 cups of cheese in all, how much cheese will she have left?

Homework: Page 129 (14-46) even