Here are some helpful websites that will reinforce essential math skills.
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Everyday Mathematics- select FREE RESOURCES* Algorithm Handbook Animations and more
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Focus Algorithms
Everyday Math Games 
Everyday Mathematics Parent Resources 
MORE Everyday Mathematics Parent Resources 
Everyday Mathematics Resources
NCTM Illuminations

Math Games by Grade Level
Mr. Maffesoli's site 
Math Games by Grade Level and Unit
BrainPOP 
BrainPOP Jr.
Multiplication Facts Practice 
Multiplication Videos 