Inequality vs. Interval Notation Posters
Help your students see the connections between the inequality symbols, the choice of open/closed points on a number-line, and the choice of soft/hard brackets in the interval notation. I encourage you to use the color-coded version so your students can ask themselves, "Can I include this point?" Green="yes, include", and red="no, exclude." The color-coding follows "stoplight logic" that even your students who struggle the most most understand.
