Chapter 7: Ratio
This section covers ratio and proportions, rates, unit conversion, metric system unit conversion, and even more advanced topics such as Fahrenheit and Celsius conversion.
aaamath.com – find the ratio
aaamath.com – determine number based on ratio
math.rice.edu – word problems with visual aids
shodor.org – a thinker if you dare to follow the tortoise and the hare.
articlesforeducators.com – challenging problem only for those who really want to think!