This 15-digit soroban 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...
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...
Set of 10 caps: $15.00Attach these 10 reusable crayon caps to crayons for independent color access! This set includes caps for ROYGBIV, black, white, and brown. The caps are black...