I love OpenMiddle problems (from kinder all the way to high school) - a source that stretches thinking and helps develop mathematical reasoning. #pypchat #mathchat https://t.co/V1bc3XrUwF pic.twitter.com/iiTcwEXFj8
— Cristina Milos (@surreallyno) November 23, 2019
from Twitter https://twitter.com/surreallyno
November 23, 2019 at 08:08PM
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