The other night, I was having trouble falling asleep. My mind could only think about school stuff. Shortly before midnight, I decided I needed to make a set of posters to help students remember how we show that a number is included or excluded in mathematics. Luckily, I had the forethought to e-mail this idea to myself. When I woke up the next morning, I'd completely forgotten about my poster idea until I opened my e-mail account.

Here's what I came up with:

These should be a handy reference for my students when we're working with inequalities and domain and range. I might make a small version for students to keep in their interactive notebooks.

Want the files for these posters? They're designed to print 2 to a letter sized page. I've uploaded them here as an editable Publisher file and a non-editable PDF file. The font is "Wellfleet."

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Those are great! I remember this being something students really struggled with.

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