Colorado Academic Standards for Mathematics (2010)
5.1.4.e.ii
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Apply the principle of fraction equivalence a/b = (n × a)/(n × b) to the effect of multiplying a/b by 1.
Translations
Common Core State Standards for Math
Apply and extend previous understandings of multiplication and division to multiply and divide fractions.
Apply and extend previous understandings of multiplication to multiply a fraction or whole number by a fraction.
Interpret multiplication as scaling (resizing), by:
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.