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Thanks for a really great project. I discovered the abacus several months ago and ordered one from China. There are excellent addition and subtraction lessons here: https://www.youtube.com/channel/UCNxgTiv9tRfrN9g4j...If the link doesn't work search for the HEV project on YouTube. These are children's classes explained slowly and clearly, just what my addled old brain needs. What's amazing about the abacus is that you slide the beads and the answer appears. There is no thinking about addition and subtraction, it is a totally different way to think about math.
Cylindrical Mirror Art