An Alternative to "Add the Opposite" from Nathan Kraft.
We started working on adding integers this week and will move into subtracting integers next week. The past two years, I have introduced it with algebra tiles and taught it as adding the opposite and the students still struggle with what to do when subtracting a negative. His alternative focuses on using number lines. My students have used number lines for adding and subtracting integers, but it has been more of an after thought than a deliberate lesson.
Combining Like Terms from Show Your Thinking
Show Your Thinking shared this MadTv video to introduce students to combining like terms. I like the hook and controversy that it can cause fro students.
Solving Two Step Equations from Jon Orr
I want to revisit this post closer to when I introduce two step equations. A double number line is used to help students determine the value of x.
Flipping Bottles also from Jon Orr
I saw some talk on Twitter about making the flipping bottles fad a math activity and Jon Orr did just that. My students definitely flip bottles more than I would like and this activity would be fun for them.