In Stanford #mathCircle for 1st/2nd grade this wk we reviewed hw incl finding "Handshake Numbers" which some saw as Triangle Numbers. I love how some enacted this. One made a cartoon showing she understands-why with, say, 20 people, there are 19+18+17+...+ 0 handshakes. #mtbos #iteachmath #mathisfun

I just heard my proposed talk for 2027 Joint Mathematics Meetings of American Institute of Mathematics (AIM, aimath.org) was accepted! I'll be sharing re: #mathCircle teaching like mine at Stanford & UNC for special session "Math Circles Everywhere: From Classrooms to Communities" #mtbos #iteachmath