Retro Technology is back! Get your students to make their own fully working Slide Rule with heaps of functions just by using the colour templates and a few simple items for assembly. On the Senior model, you can: multiply, divide, find the reciprocal, find squares, square roots, cubes, cube roots, do all trigonometric calculations (sine, cosine, tangent), work with logarithms in base 10 and base e. Pi indicator shown for circle calculations. This is the tool that engineers and Math geeks used for years. See how you can turn a sheet of cardboard into a handy calculator in 20 minutes, with surprising accuracy! Take a stroll down Geek Street, Nerdsville and do the Math like an old pro!