WolframAlpha helps you answer questions in a step by step manor.
Under the Sea:This is a site where the student is a fish solving math problems to grow up big and strong. No login required.
Math Run: Beat the clock with math facts
Online Smart Board Graph
IXL: This is a wonderful site for drilling concepts. All levels from Pre-K to Geometry. Free and paid version available.
Cyber Chase Math Games
Counting with manipulatives
Mr Nussbaum Math Games