10 Easy Math Tricks

http://listverse.com/science/10-easy-arithmetic-tricks/

Math can be terrifying for many people. This list will hopefully
improve your general knowledge of mathematical tricks and your speed
when you need to do math in your head.

[This text taken from the website] 
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ReadyMechs

http://readymech.fwis.com/

Readymechs are free, flatpack toys for you to print and build. They are 
designed to fit on an 8.5"x11" page and printed with any printer. You'll need 
double-sided tape, thick matte paper, and 10-15 minutes for build time.

[This text taken from the website] 
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