There are so many great class opener activities that I decided I need a place to document them all so that I can make sure I’m am choosing the best tasks for my students.

[UPDATE: I presented a session on Warm up Routines & blogged about it here]

- Sadie Estrella’s Counting Circle because it develops number sense, mental math, and community
- Mary Bourassa’s Which one Doesn’t Belong? thought-provoking puzzles. There are no answers provided as there are many different, correct ways of choosing which one doesn’t belong.
- Elizabeth (@cheesemonkeysf) Talking Points because students practicing listening to each other will seep into every lesson, every day. It can be used as a tool to develop their growth mindset and, bring out and clarify misconceptions.
- Andrew Stadel’s estimation Builds number sense & measurement
- Fawn Nguyen’s Visual patterns Develop algebraic reasoning skills
- Find the Flub through the week I photograph good student errors, then choose 1 for students to correct and analyze each week. Similar to my favorite no. I sometimes use errors from Michael Pershan’s mathmistakes.org
- Balance puzzles Help students to solve & understand algebraic equations
- Agree or disagree math & Would you Rather? for sparking a debate
- Daily SET puzzle and how Michael Fenton implements it here
- Mental Math basic math skills review. No calculators.
- ACT question of the day
- Dan Meyer’s Graphing Stories Helps students create graphical representation of real events, described here.
- Number Talks Build computational fluency using number relationships and the structure of numbers. Fawn set up a site which gives an idea of how these are supposed to go. This article by Sherry Parrish describes it well. I’ve found this worthwhile even with high school students.
- Also, this! Number Talk Images. I am overwhelmed at the information and content found on this site!

- Fraction Talks are a new, fun tool for fraction number talks.
- Dan Meyer’s 101 Questions website is an amazing Notice & Wonder resource. I do it where every student has to come up with a mathematical question for the image or video that randomly comes up that day
- Robert Kaplinsky’s Open Middle Problems
- Chris Luzniak’s Table Debate More info from his TMC15 presentation here
- Dylan Kane’s Match my Graph
- I can’t wait to try Clothesline Math next semester!

“The Clothesline is the master number sense maker.”

- Marisa W @viemath does Mindset Moments occasionally. Her Words:

*After watching the video, all I would ask every time is, “What did you think is the message in this Mindset Moment video? What is your one big takeaway?”* - Area Mazes These would be great for supporting number sense, equations, factors

Do you have a warm up routine or activity that is beneficial to students, but is not on this list? Recommend it here:

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These warmups are great and I have been referring to your blog on a weekly basis for the past year so I thought it was time to say thanks!

Thank you so much! I’m so glad it has been helpful to you. This just made my day!

[…] LINK to Crazy Math Teacher Lady’s blog […]