Math Dice: Plus and Minus
thingiverse
I made this **plus and minus** die for my daughter. It makes it fun to practice addition and subtraction. She'll write two columns of numbers, then roll to see whether she'll add or subtract the numbers. Customized version of http://www.thingiverse.com/thing:1919139 Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=1919139
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