This is a quadratic adaption of the Montessori beads to learn counting/calculation.

The idea is that 10 of the small cubes give you one stick.

10 sticks give you one plate and 10 plates give you one cube.

In this way a child can get an intuition of how the 10-based counting system works.
For example the number 1231 equals to one cube, 2 plates, 3 sticks and one small cube.

I scaled the everything to a edge length of 0.7 cm to print on less plates and save filament.
Maybe you want to increase that to 1 cm or even more.