Quia
Ixl Learning: Adding Mixed Numbers
Brush up on your math skills pertaining to adding mixed numbers then try some practice problems to test your understanding.
The Math League
The Math League: Fractions
This tutorial covers all types of fractions with simple explanations on how to work with them.
Math Slice
Math Slice: Fraction Slice Special Test
A succinct tool for assessing decimal and fraction concepts. Assessment is scored online. An excellent tool for use as a quick assessment.
Other
Dan's Math: Basic Skills Topics
College professor Dan Bach offers a review of various basic topics in arithmetic, pre-algebra, and algebra. Order of operations, exponents, square roots, variables, and combining terms are just a few of the many topics covered.