Waldomaths by Ron Barrow has extensive resources for students to
explore. These work well on the interactive whiteboard. I like
using these in class as students can then experiment themselves
at home. A recent addition is this applet on fractions which
allows students to study examples and see how to handle
fractions. The fractions A and B can be changed and students can
see how to add, subtract, multiply or divide the two fractions.
I have used and like many of these applets - Circle Theorems for
GCSE for example or the Normal Distribution in KS5 to show how
the probability changes for different areas under the curve. (I
have used this together with a Normal Distribution calculator –
see link on this page).