NumSum - stack numbers to learn mathematics

thingiverse

These numbers are meant to help kids to learn and improve their basic mathematical skills. It is as easy as stacking the numbers and compare the heights. Every number has the height of its value. For example - the height of 3 two-blocks match the height of a six-block. The concept is not new. And there are various sets made of wood out there. These may be natural but are very expensive. Learning should never be expensive!