1. Adding and Subtracting Unlike Fractions 3.6

2. 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)

3. 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

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

5. Write the answer in simplest form. + Find a common denominator: 4(5) = 20. Multiply by fractions equal to 1. Rewrite with common denominators. Add numerators. Keep the denominator. Rewrite as a mixed number.

6. Write in Simplest Form:

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

8. 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?

9. Homework: Page 129 (14-46) even