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Multiplying and Dividing Fractions. We will use a square area model to look at multiplying fractions. Example. Let’s make the height of our unit square ½. Let’s make the base ¼ . Move the second square over the first. Note the unit square is now broken into 8 equal pieces. 1.
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We will use a square area model to look at multiplying fractions. Example Let’s make the height of our unit square ½. Let’s make the base ¼ . Move the second square over the first. Note the unit square is now broken into 8 equal pieces. 1 The answer is the intersection of the two shadings.
Let’s try one more model. Example • Remember: • Build both • Overlap these • Read answer
When multiplying fractions, fly across the top and then across the bottoms… Multiply the numerators Then multiply the denominators
Example #2: You can make this problem easier by cross cancelling.
Example #3: When multiplying mixed numbers, change these to improper fractions. Then cross cancel, if possible.
Example #4: When dividing, you need to multiply by the reciprocal.
Example #6: A cabinet maker needs ¾ of a running yard of a pine wood for the door of one of his cabinet. He will be making 8 cabinets. How much wood will he need altogether? The cabinet maker will need 6 running yards of pine wood.
