RSS BotMB to Hacker NewsEnglish · 21 days agoLearning the soroban rapid mental calculation as an adultgithub.comexternal-linkmessage-square0fedilinkarrow-up19arrow-down10file-text
arrow-up19arrow-down1external-linkLearning the soroban rapid mental calculation as an adultgithub.comRSS BotMB to Hacker NewsEnglish · 21 days agomessage-square0fedilinkfile-text