This very easy mechanical calculator helps elementary students to understand better the way of addition and subtraction in decimal system. The calculator is limited on three digest.
I was positively surprised, when I see that my daughters use the calculator for a lot of mathematical experiments and discuss their findings.
A demonstration you can find here: https://youtu.be/vinljlGeGMQ
For adding 496+153 first you have to do the following steps:
For subtraction turn the gears in step 3 counterclockwise.
If you are not interested in educations, the mechanical calculator is a cool Steampunk device.
| Base.stl | 159.9KB | |
| CalcGear_3x.stl | 228.8KB | |
| CalcPin_3x.stl | 33.5KB | |
| CarryGear_2x.stl | 59.7KB | |
| CarryPin_2x.stl | 31.1KB |
