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toddf9.bsky.social
High School math teacher. Desmos Fellow.
25 posts 101 followers 85 following
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Posts 12 Comments 13

Gee willikers, AI is amazing and forcing me to rethink how I ask questions. Is it even possible? Here's what I think of as a semi-guided "thinking" question. Google's solution in the comments.

submitted 1 day ago • 1 comment

I was driving home along a highway at 60 miles an hour. When I got exactly 60 miles from home I decided I would gradually slow down so that my speed was exactly my distance from home. How long did it take me to get home? What was my average speed? How long did it take to get 1 mile from home? #BTC

submitted 14 days ago • 0 comments

Cool student @desmos graph. www.desmos.com/calculator/p...

submitted 29 days ago • 1 comment

Annual quadratic ball toss day. Now on BlueSky!

submitted 42 days ago • 1 comment

Wondering: f(x)=2x is a line with slope 2. f(x)=3x is a line with slope 3. So: g(x)=x•x is a “line” with slope that changes with x, so it will be a curve. But: the pattern would say that the slope at x=3 is 3, at x=4 is 4, etc. But we know that the slope at x=a is 2a. <cont>

submitted 47 days ago • 2 comments

Ok, #IteachMath. Question: Why do we (typically) teach solving absolute value equations by "splitting it" into two equations (******=3 or ******=-3), but we teach solving square root equations by writing *******=+/- 3? By "we," I mean me, but I'm guessing many of you too. 🤔

submitted 85 days ago • 5 comments

Hey @xkcd.com ! Hope you saw Kirk Cousins checking out your book on the Netflix series “Quarterbacks”.

submitted 441 days ago • 0 comments

Curious: what software do you use for mathematical typesetting? For making tests, etc. I use equatio, which is great for lots of things, but is not so great at alignment with text. Any suggestions? #iteachmath

submitted 478 days ago • 3 comments

@davidkbutler.bsky.social students love star battle

submitted 498 days ago • 1 comment

My yearly post that graphfree.com is amazing.

submitted 505 days ago • 0 comments

Desmos 3D is live! I’ve been looking forward to this for years. I imported a project one of my students did a few years ago in Algebra II. It’s created by using systems of inequalities. # desmos3d www.desmos.com/3d/d4f0d71636

submitted 519 days ago • 1 comment

“I would say that the best thing you could do for honey bees right now is not take up beekeeping.” Done and done. www.nytimes.com/2023/08/19/b...

submitted 521 days ago • 0 comments