5.NF.B.5

Interpret multiplication as scaling (resizing), by:

 
2 Lesson(s)
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Fraction Cover Up

5th Grade Math » Unit: Fractions
5th Grade Math » Unit: Fractions
Cathy Skinner
Scottsdale, AZ
Environment: Urban
 
Big Idea:

Students need to concrete models be able to see the exchange of fractions with unlike denominators.

 
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sandwich fraction
   

Making Sense of Multiplying Fractions

5th Grade Math » Unit: Multiplying and Dividing Fractions
5th Grade Math » Unit: Multiplying and Dividing Fractions
Julie Kelley
Tyngsborough, MA
Environment: Suburban
 
Big Idea:

Students participate in a fish bowl activity where they listen to classmates' cooperative discussion about reasoning when multiplying fractions.

Standards:
 
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Reflections (1)
lesson

Comparing the size of a product to the size of one factor on the basis of the size of the other factor, without performing the indicated multiplication.

Explaining why multiplying a given number by a fraction greater than 1 results in a product greater than the given number (recognizing multiplication by whole numbers greater than 1 as a familiar case); explaining why multiplying a given number by a fraction less than 1 results in a product smaller than the given number; and relating the principle of fraction equivalence a/b = (n × a)/(n × b) to the effect of multiplying a/b by 1.

Common Core Math
 
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