In this video I show scale factor as a unit rate, and constant of proportionality. I show examples of using the scale factor to calculate missing side measurements when the scale is greater than 1 and less than 1.

This can also be used as a supplemental resource for Eureka Grade 7 Mathematics: Module 1: Topic D: Unit Rate as the Scale Factor.

Calculator I recommend for Math 7 - Pre-Algebra. It can do almost anything inside of Algebra 1 as well and is fairly inexpensive.
https://amzn.to/2qRWmfE

For Some fun IQ Puzzles to help build up your math brain check out my Amazon Shop.
https://www.amazon.com/shop/ericbuffi...