Soroban (Japanese abacus)
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Soroban of 13 columns. For the inquisitive, I recommend visiting Wikipedia to gain a deeper understanding than I can provide here. Arithmetic can be approached in an innovative way for kids and adults alike, making it an entertaining means to refresh one's math skills. The Wikipedia link: https://fr.wikipedia.org/wiki/Soroban A search on Google will yield numerous websites and videos explaining how this ancient tool works. Once the logic is grasped, it becomes a valuable asset, often surpassing the speed of a smartphone calculator. Three millimeter diameter metal rods are all that's needed to get started. I personally relied on this reference: https://www.amazon.com/dp/B00NQCNBX2
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