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Multiplying and Dividng Fractions

Multiplying and Dividng Fractions. Reciprocal Multiplying Fractions Dividing Fractions. QUIZ: Multiplying Fractions. QUIZ: Dividing Fractions. Multiplying Fractions. Change any mixed numbers into improper fractions.

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Multiplying and Dividng Fractions

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  1. Multiplying and Dividng Fractions • Reciprocal • Multiplying Fractions • Dividing Fractions QUIZ: Multiplying Fractions QUIZ: Dividing Fractions

  2. Multiplying Fractions • Change any mixed numbers into improper fractions. • Change any whole numbers into improper fractions by putting 1 under the whole number. • Cross cancel wherever possible. • Multiply horizontally. • Reduce if necessary. EXAMPLES

  3. Reciprocal To find the reciprocal of a fractions, flip it! You need the reciprocal when dividing fractions! EXAMPLES: 23 3 2 2½ = 5 2 2 5

  4. Dividing Fractions • Change any mixed numbers into improper fractions. • Change any whole numbers into improper fractions by putting 1 under the whole number. • KEEP – SWITCH - FLIP • Cross cancel wherever possible. • Multiply horizontally. • Reduce if necessary. EXAMPLES

  5. 38 4 9 38 4 9 X X Examples of multiplying fractions Another Example 2 3 1 1 12 1 3 • X 2 = 2 • 1 X 3 = 3 X

  6. Examples of multiplying fractions 2 ½ X ¼ 51 2 4 5 8 X

  7. 512 9 10 X Examples of dividing fractions Another Example 510 9 12 FLIP SWITCH KEEP 14 3 2 1 3 4 2 4 6 2 3 x

  8. 79 2 4 FLIP SWITCH KEEP 10 18 5 9 1 1 Examples of dividing fractions 3 ½ 2 ¼ 74 2 9 28 18 x

  9. CHECK ANSWERS

  10. Back to Quiz

  11. Quiz: Dividing Fractions • 6 divided by 3 ½ = • 4/5 divided by 2/5 = • 1 ½ divided by 3 ¾ = • 3 ½ divided by 1 ¾ = • 2 ½ divided by 2 ½ = • 5 1/3 divided by 4/9 = Check your answers

  12. Answers: Dividing Fractions • 6 divided by 3 ½ = 1 5/7 • 4/5 divided by 2/5 = 2 • 1 ½ divided by 3 ¾ = 2/5 • 3 ½ divided by 1 ¾ = 2 • 2 ½ divided by 2 ½ = 1 • 5 1/3 divided by 4/9 = 12 Back to Quiz

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