Why animations in Maths Lessons?
Animations on an interactive whiteboard can provide students with the real life example of a mathematical concept. Other reasons to use animations include: providing concrete reinforcement for abstract concepts, visual repetition for various concepts, and creating an interactive lesson where the was not one formally.

Resources:
Absorb Maths Resources - http://www.absorblearning.com/en/Free_online_Absorb_resources/
http://www.science-animations.com/MathsAnimations.html
http://www.glencoe.com/sites/common_assets/mathematics/math_tools/ToolsInterface.html
http://www.eduplace.com/math/mw/tools/tt_2.html