File cabinet

I’ve found it helpful to store links to things here if I want to be able to find them quickly for my own use in the future. If they’re useful to you, that’s all the better!

Algebra 1

  • Generate a scatterplot with any r-value with this Geogebra applet by David Wees.
  • Vocab party files to support ELL students in Algebra 1, by Rick Barlow. (The blog post includes a link to the actual files)
  • This Teachers Pay Teachers store is for Algebra 1 and seems pretty good. I haven’t checked it out in detail yet.
  • Multiplying binomials using algebra tiles on Desmos. I’m not sure who created this, but it’s nice. I’ve also made a version in the Activity Builder here.
  • Julie Reulbach created this helpful list of Algebra 1 teachers on Twitter.
  • Drawing a pet house using linear and non-linear graphs on Desmos. By MathyCathy.
  • In a unit on function transformations, I wonder if advanced students might be interested in this video on a visual, transformational approach to General Relativity.
  • Fascinating visual of which quadratics are factorable, and which are not. By Scott Farrar.
  • Visual explanation of why anything^0=1. By me.
  • Visual riddle about slope. On Desmos. By Nick Corley. (And my backup copy)
  • A linear(ish) situation with a negative slope. Harry O’Malley pounding a nail into a board.
  • A linear situation with a positive slope. Harry O’Malley putting little cubes in a cup.
  • Domain and range card sort with feedback, by Bob Lochel. (And my backup copy).
  • Hilarious task about modeling linear scenarios (dancing to “Shout”) that employs slope-intercept and point-slope form. By Paul Jorgens. (And my backup copy).
  • How double number lines can be transformed into graphs, by Suzanne von Oy. (And my backup copy).  Related: Middle School Shuffle, sent to me by Kate Nowak (not sure if she made it herself). And a version by Eric Berger (with my backup copy).
  • Pumpkin time bomb, by Jon Orr.
  • Desmos activities for Algebra 1, by Nick Corley.

Algebra 2

  • Completing the square Desmos lesson, by Bob Lochel (and my backup).
  • Completing the square paper lesson (perhaps for use after the Desmos one), by David Wees.


  • Explanation of what a radian is, by Luke Walsh. (And here’s my backup copy in case he deletes it).
  • Visualization of sin, cos, tan and reciprocals on the unit circle. By Ben Sparks.
  • 1-minute dance video on end behavior and multiplicity of roots. By Julie Reulbach. Note that the 6th-degree function should be labeled “even end behavior,” not “even function.” Just discuss that with your kids.
  • Visualization of exponential growth (bacteria multiplying). By Anna Blinstein.
  • Desmos calculator that zooms in on any region of a graph, by @davidkbutlerUoA
  • Twitter thread (which I haven’t completely read, but I’m bookmarking here for further reading) about how to think about what a function is.

Family/recreational math

Probability and Combinatorics


  • A summary of a study on the benefits of spaced retrieval practice. Summary by Efrat Furst. Study by Rawson, K. A., Dunlosky, J., & Sciartelli, S. M. (2013), “The power of successive relearning: Improving performance on course exams and long-term retention.”
  • Some day I may decide to read the articles in this twitter thread started by Efrat Furst.

General Tools