https://www.youtube.com/watch?v=RQ2nYUBVvqI
http://www.learnalberta.ca/content/mesg/html/math6web/index.html?page=lessons
https://www.youtube.com/watch?v=liW_ALj4Qj8
Modeling Rates
Percents to Fractions Math Is Fun Lesson and Practice.
Percents to Decimals Math Is Fun Lesson and Practice.