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arrow-up11arrow-down1imageMental Calculation. In Public School of S. A. Rachinsky - Nikolay Bogdanov-Belsky (1895)upload.wikimedia.orgcraftyindividual@lemm.eeM to artporn@lemm.ee · 8 months agomessage-square4fedilink
minus-squarekrewjew@lemmy.worldlinkfedilinkarrow-up0·8 months agoNever seen this before. It’s incredible!
Never seen this before. It’s incredible!