Learn basic math with binary coins
thingiverse
Inspired by FalconPhysics' Binary Coins, I set out to design my own set, this time with corresponding sides for each coin value. My little learners, affectionately known as kids, love grasping the concept of binary counting using these coins. Simply ask them for a number between 1 and 127, and they'll have to come up with the correct coin combination - for instance, 111 equals 64 + 32 + 8 + 4 + 2 + 1. It also works in reverse, by the way;). If you discover an innovative method of teaching addition and subtraction using these coins, I'd love to hear about it.
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