Working and playing at the intersection of mathematics and children's minds. Author at Stenhouse. Public Math. (Find me on blue sky, where I am triangleman.)
Some days in this job, supporting your colleagues means going back through your Twitter feed for examples that illustrate very particular math ideas.
And SOME days, that leads you to this kind of beauty!
Day 134: Today our brilliant bunch learned how to multiply a whole number by a mixed number. One observant student quickly noticed, "The denominator doesn't change, so you can just multiply the numerator and the whole number."