Inspired by falconphysics binary coins (https://www.thingiverse.com/thing:957569) I wanted to create my own set, but with corresponding sides for the coin values. My little computers... ahm kids... love to learn the concept of binary counting with those coins. Just ask for a number between 1 and 127 and they have to give you the correct coin combination, e.g. 111 = 64 + 32 + 8 + 4 + 2 + 1. Obviously it also works the other way around ;)
Let me know if you find a clever way of learning addition and substraction with these coins.
Designed in Tinkercad
Sliced with Cura 3.6.0