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; and 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.
Lessons

Understand how numbers scale using multiplication and visual representations
In this lesson you will learn to identify how numbers scale up in multiplication problems and visual representations.

Predict the product of multiplying a fraction less than one by a whole number
In this lesson you will learn how to predict the product of a fraction less than one multiplied by a whole number by using visual representations.
Resources