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Multiplying Fractions. Goals: I can figure out how to solve multiplication problems with fractions in real-world situations.

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multiplying fractions

Multiplying Fractions

Goals:I can figure out how to solve multiplication problems with fractions in real-world situations.

Standard:MCC5.NF.6: Solve real world problems involving multiplication of fractions and mixed numbers, e.g., by using visual fraction models or equations to represent the problem.

Credits:Special thanks to Kelly Katz, for some of the slides in this presentation.

butterfly method
Butterfly Method

1

1

_5_

12

  • _6_
  • 10

2

2

butterfly method1
Butterfly Method

1

1

_5_

12

  • _6_
  • 10
  • 1
  • 4

=

2

2

butterfly method2
Butterfly Method

1

1

_4_

6

  • _3_
  • 4

2

1

butterfly method3
Butterfly Method

1

1

_4_

6

  • _3_
  • 4
  • 1
  • 2

=

2

1

butterfly method4
Butterfly Method

5

1

20

8

_4_

4

2

1

butterfly method5
Butterfly Method

5

1

20 8

4_

4

5

2

=

2

1

what is wrong with this answer
What is wrong with this answer?

52

Which type of fraction is it?

Proper Fraction

Improper Fraction

improper fraction mixed number
Improper Fraction → Mixed Number
  • Divide the numerator by the denominator
  • Put the remainder over the denominator

Write the

remainder

over the

denominator

2

Divide the

numerator by

the denominator

  • R 1

2

  • 5
  • 2

4

  • 1
  • 5
  • 1

2

=

2

2

convert the improper fraction to a mixed number4
Convert the improper fraction to a mixed number:

If there is no remainder then your answer is a whole number!

  • 10
  • 2

5

slide15

Name:__________________Date:____________________Group:_____

I can: demonstrate my knowledge of multiplying fractions!

Multiply these fractions (using butterfly method)!

  • 5 x 4 = 2. 3 * 7 =

8 10 6 9

Multiply (using butterfly method) these fractions and turn your answers into mixed numbers! Don’t forget to simplify!

  • 3. 2 x 18 = 4.8 x 27 = 5. 12 x 4 =

3 10 9 2 3

Simplify these Fractions!

6.12 = 7. 6 =

24 18

  • 8. Cody has 27 marbles. Five-Ninths of the marbles are purple. How many marbles are purple?_______ are purple
  • 9. How many are not purple? _______ are not purple
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