Fraction Multiplication

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Fraction Multiplication

• And Cancelation

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Fraction Multiplication

• Here are some fraction multiplication problems
• Can you tell how to multiply fraction from these
  examples?

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Multiplication

• Multiply numerator by numerator
• And denominator by denominator

4
Try some.

• Multiply the following

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Answers

• Multiply the following

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Mixed Numbers

• Because of the order of operations,
• Mixed numbers cannot be multiplied as is
• Change mixed numbers to improper fractions, then
  multiply.

7
Try some

• Change any whole or mixed numbers to improper.
• Multiply straight across.
• Simplify answers

8
Answers

• Change any whole or mixed numbers to improper.
• Multiply straight across.
• Simplify answers

9
Cancelling

• Reduce before you multiply

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Canceling

• Reducing before mutiplying is called canceling.
• ICK! Instead think the following in your head.

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Canceling on paper

• Rules One factor from any numerator cancels with
  like factor from the denominator.

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Try one

• Say --- goes into ____ this many times.
• As you cross each number out and write what is
  left after canceling above the number.

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Answer

• Say --- goes into ____ this many times.
• As you cross each number out and write what is
  left after canceling above the number.

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Try one more

• Make whole and mixed numbers improper
• Cancel if you can
• Multiply Numerators and denominators straight
  across.
• Simplify

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Answer

• Make whole and mixed numbers improper
• Cancel if you can
• Multiply Numerators and denominators straight
  across.
• Simplify