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Pancakemath essentials summarized on mugs and such, as developed in Dave Zethmayr's "Let's Say: a Child's First Calculus" Pancakemath is ideal as a first sandbox for anyone's experience of mathematical proof. A two-symbol arithmetic, one invisible!
$22.00
$9.00
$26.00
$7.50
$16.00
$15.00
$14.00
$17.00
$16.99
$24.00
$4.24
$5.00