A day's worth of math problems... OK, maybe a year's worth for a few of us. Some of them are much easier than
others, and you can probably guess the result of the equations without
actually remembering basic math... but it kind of makes you think!
measures 11½ inches in diameter
requires 1 AA battery (not included)
for orders/enquiries click here or phone 617.864.8188
Joie de Vivre, Cambridge, Massachusetts