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[ptarmigan]

I always tell my students that they need to watch me like a hawk. When they point out my errors, I just fix them, laugh at myself a little (if the error is amusing), and move on. Yesterday I got to the end of a problem and had a different result from what I'd remembered, and just said, "Wait, did I mess up somewhere?" and they told me where. The number of arithmetic errors I make in class is crazy.

[conjugate]

ABD_JHS, it sounds like you're handling it about right.  My students will point out when I miss a minus sign or when I forget a multiple of ½; they no longer even joke about whether I will count off if they make the same mistake.  They know I will, but not too harshly.