Retro Technology is here! Make your own working slide rule! Yes, you can all do the math with a simple-to-use slide rule, using the templates through a colour photocopier. You will be able to multiply, divide, square a number, find the square root of a number, and more! This model can be made in about 20 minutes, and only needs a few basic materials and equipment. It is useful in showing kids how the engineers of old did their calculations to do projects like build Hoover Dam or send men to the moon. You can make a class set and then assign questions to suit. Enjoy your trip down memory lane to Geek Street, Nerdsville, and do the Math like an old pro!