multiply fractions shortcut

Download Multiply fractions shortcut

Post on 29-Nov-2014

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Shortcut to multiply fractions. Students may choose to work multiplication problems with this method to shorten the time needed to work the problem.

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  • 1. Multiplying Fractions Goals: I can figure out how to solve multiplication problems with fractions in realworld 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.
  • 2. Shortcut Method Warning: This method will not work with every multiplication problem. Be prepared to at all times to multiply large number & simplify large numbers.
  • 3. Shortcut Method 1 1 2 2 _5_ _6_ 12 10
  • 4. Shortcut Method 1 _5_ _6_ 12 10 2 2 1 = 1 4
  • 5. Shortcut Method _3_ _2_ 7 5
  • 6. Shortcut Method _3_ _2_ 6 35 7 5 =
  • 7. Shortcut Method 1 1 2 1 _4_ _3_ 6 4
  • 8. Shortcut Method 1 _4_ _3_ 6 4 2 1 1 = 1 2
  • 9. Shortcut Method 13 6 _1_ 4
  • 10. Shortcut Method 13 6 _1_ 13 24 4 =
  • 11. Shortcut Method 5 2 20 8 _4_ 4 1 1
  • 12. Shortcut Method 5 2 20 8 4_ 4 1 1 = 5 2
  • 13. What is wrong with this answer? 5 2 Improper Fraction f eo yp h t is it? hic ion W ct fra Proper Fraction
  • 14. Improper Fraction Mixed Number 1. Divide the numerator by the denominator 2. Put the remainder over the denominator Divide the numerator by the denominator 2 2 5 4 1 R1 2 5 = 2 Write the remainder over the denominator 2 1 2
  • 15. Convert the improper fraction to a mixed number: 7 3 2 1 3
  • 16. Convert the improper fraction to a mixed number: 8 3 2 2 3
  • 17. Convert the improper fraction to a mixed number: 9 2 4 1 2
  • 18. Convert the improper fraction to a mixed number: 11 5 2 1 5
  • 19. Convert the improper fraction to a mixed number: 10 5 If there is no remainder then your answer is a whole number! 2
  • 20. Name: __________________ Date: ____________________ Group: _____ I can: demonstrate my knowledge of multiplying fractions! Multiply these fractions (using Shortcut Method)! 2. 3 x 7 = 6 9 1. 5 x 4 = 8 10 Multiply (using Shortcut Method) these fractions and turn your answers into mixed numbers! Dont forget to simplify! 3. 2 x 18 = 3 10 4. 8 x 27 = 9 2 5. 12 x 4 = 3 Simplify these Fractions! 6. 12 = 24 7. 6 = 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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