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Fraction Multiplication and Division Algebra Seminar 2012-2013

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Fraction Multiplication Here are some fraction multiplication examples. Can you tell how to multiply fraction from these examples?

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Multiplying Fractions Together 1.) Multiply numerator by numerator straight across the top of the fractions. 2.) Multiply denominator by denominator straight across the bottom of the fractions.

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Practice

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What if our fraction is in the form of a mixed number? Because of the order of operations, mixed numbers cannot be multiplied. Change mixed numbers to improper fractions, then multiply.

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Some to try. 1. Change any whole or mixed numbers to improper fractions. 2. Multiply straight across. 3. Simplify answers.

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Fraction Division (Opposite of Multiplication)

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Dividing two fractions is the same thing as multiplying by the reciprocal : To find the reciprocal of a fraction you flip the numerator and denominator

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Dividing Fractions Example Keep the first fraction the same. Change the division sign to multiplication. Use the reciprocal of the second fraction. Then multiply!

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Tanner had a pizza and was planning to eat one-fourth of the pie. Jackson came over and Tanner was nice enough to divide his quarter in 2. How much of the pizza did each person get?

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Dividing Fractions with Mixed Numbers Remember! We cannot multiply mixed numbers. We must change them to improper fractions first!

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Some More Practice

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Levi made fudge this weekend. He wants to put 5 1 / 3 lbs of chocolate into separate containers. Each container holds 2 / 3 lb. How many containers will he need?

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