# 5.NF.B.5

Interpret multiplication as scaling (resizing), by:

**a**
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.

**b**
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 $a/b = (n \times a)/(n \times b)$ to the effect of multiplying $a/b$ by $1$.

## Tasks

Running a Mile

Reasoning about Multiplication

Grass Seedlings

Fundraising

Calculator Trouble

Comparing a Number and a Product

Comparing Heights of Buildings

Mrs. Gray's Homework Assignment

Scaling Up and Down