On the video, the rapper known as 2 Pi reels off rhymes as teenagers in classrooms and hallways sway and bop to the music. It's upbeat. It's catchy. It's . . . math. We solve triangles one by one We ...

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Counting will get you nowhere. Try a little combinatorics instead. By Kenneth Chang A couple of weeks ago, I wrote about a viral math problem — 8÷2(2+2) = ? — that drew the disdain of many ...

Is it 1 2 or no triangles? I make short, to-the-point online math tutorials. I struggled with math growing up and have been ...

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Adjust the colors to reduce glare and give your eyes a break. Use one of the services below to sign in to PBS: You've just tried to add this video to My List. But first, we need you to sign in to PBS ...