Basic MathPre-Algebra
Algebra 1Geometry
Algebra 2Pre-Calculus
CalculusStats
SATACT
Computer ScienceMore coming soon!

About H2O Worldwide

Help the world one math problem at a time. Every time a question is answered correctly we donate an ounce of water through Charity: Water to help provide impoverished areas around the world with clean water. Get started by choosing a category on the left!

Person drinking dirty water The world Person drinking clean water Unity of the world
In many places around the world there is no access to clean water. Dirty water is the only option. Clean water is not a guarantee across the globe. Help unite the world against dirty water. Clean water is a natural human right. Not only is it a resource, clean water is a way of life. Clean water should be enjoyed by all of humankind. Answer math questions to help us achieve this goal.
Read More about the Water Crisis