About 
I'm Dan and this is my blog. I'm a former high school math teacher and current head of teaching at Desmos. He / him. More here.

7 Comments

  1. I really like the mistakes website as a way to draw attention to larger conceptual misunderstandings that persist.

    Students go through and if they make a mistake in Algebra:

    1/(x+1)=1/x+1/1

    they often get told they can’t do that.

    but they don’t get an explanation of when f(a+b)=f(a)+f(b)