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Reducing Before Multiplying Fractions

Reducing Before Multiplying Fractions. NS 2.1 Solve problems involving addition, subtraction, multiplication , and division of positive fractions and explain why a particular operation was used for a given situation. Today’s objective: learn how to multiply fractions

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Reducing Before Multiplying Fractions

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  1. Reducing Before Multiplying Fractions

  2. NS 2.1 Solve problems involving addition, subtraction, multiplication, and division of positive fractions and explain why a particular operation was used for a given situation. • Today’s objective: learn how to multiply fractions • Learning target: Answer at least 3 of the 4 fraction multiplication problems correctly on the exit ticket.

  3. It is easier to multiply together smaller numbers. • Why reduce before multiplying fractions?

  4. By dividing the numerator and denominator of a fraction by the same number: • Instead of • We can do • How are we allowed to reduce fractions before multiplying?

  5. Reduce the fractions before multiplying

  6. When multiplying fractions, we can also reduce diagonally: • What is cross-canceling? Note: this is different from cross-multiplying! Cross-multiplying is when there is an equals sign in between the two fractions/ratios

  7. Cross-cancel before multiplying

  8. Convert the mixed number into an improper fraction. • What if we are multiplying a mixed number?

  9. Simplify the answer if possible.

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