Soroban - Fully Parametric & Configurable Abacus
I recently watched a video of Japanese school kids using their Soroban to calculate at incredible speed; apparently it also helps with learning to do very fast mental calculation. I was impressed, and wanted to try and learn that – after…
- Pobrania
- 297
- Polubienia
- 39
- Ocena
- 4,5






