Two (perhaps) quick(ish) ways to multiply two digit numbers in your head

🏃🏻❌💡 While tutoring students who are in the process of multiplying two numbers, I sometimes challenge myself by trying to do the multiplication in my head instead of using a calculator. I don't know where I learned it, but I usually take a divide-and-conquer approach to multiplying large numbers, a large number for me being … Continue reading Two (perhaps) quick(ish) ways to multiply two digit numbers in your head