Fraction Butterfly Anchor Chart - cross multiply to find equivalent fractions to compare fractions or add & subtract fractions with different denominators. A visual reminder of the strategy for adding & subtracting fractions found in the CCSS 5.NF.A.1 (a/b + c/d = (ad + bc)/bd). See http://www.corestandards.org/Math/Content/5/NF/A/1/. This is not intended to be taught on its own, but can serve as a reminder after the concepts that explain why this works have been taught.
Collaborative Problem-Solving in Math - students work independently to solve a problem then get together in small groups to build their best constructed response from individual answers. $ Great test prep!
Sites that I can't do without as a math teacher (and what's so special about each one!) Links to virtual manipulatives, discovery-based lessons, free graphing software, question prompts, eBooks, and more.... Tons of resources for math teachers