Mathlete is a hand-drawn typeface as sweet as Pi. You can download it here for the steep price of zero dollars.
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The download package contains four different styles (Skinny, Skinny Slant, Bulky, and Bulky Slant) and a pre-packaged @font-face kit for use on the web. You're free to use this in commercial & personal work, but please don't redistribute or resell this typeface in any way.