Educational Materials

Adapted from https://www.wikihow.com/Use-an-Abacus An abacus is a deceptively simple calculating tool that has been used for thousands of years. This short booklet has instructions on how to use an abacus...

This 15-digit soraban abacus features a 1:4 bead layout (one bead worth 5 on the top deck, and four beads each worth 1 on the bottom deck. The orange plastic...