RSS BotMB to Hacker NewsEnglish · 7 hours agoLearning the soroban rapid mental calculation as an adultgithub.comexternal-linkmessage-square0fedilinkarrow-up18arrow-down10file-text
arrow-up18arrow-down1external-linkLearning the soroban rapid mental calculation as an adultgithub.comRSS BotMB to Hacker NewsEnglish · 7 hours agomessage-square0fedilinkfile-text