Math Dice: Plus and Minus
thingiverse
I created this plus and minus die for my daughter, making it a fun way to practice addition and subtraction. She writes two columns of numbers, then rolls the die to see whether she'll add or subtract the numbers. Customized from http://www.thingiverse.com/thing:1919139. Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=1919139
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