Numeracy in your lesson, an interactive calculator for the white board, another great bookmark!
A great way to introduce a visual numeracy task into your lesson is to show an observer the use of an interactive calculator on a whiteboard. I have bookmarked this page and use the calculators when I need to.
I am not taking credit for these, I just found them on the web, so thank you to whoever created the calculators. You will need flash installed to view the resource.