Dr. Halcyon Foster's Avatar

Dr. Halcyon Foster

@infinigon.bsky.social

I write math puzzles. I teach kids. I bake ridonkulous cookies.

89 Followers  |  80 Following  |  268 Posts  |  Joined: 13.11.2024  |  2.3147

Latest posts by infinigon.bsky.social on Bluesky

I actually super love it. Maybe Iโ€™ll use it on a test.

10.08.2025 23:21 โ€” ๐Ÿ‘ 1    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

Steve I do not enjoy this bc it looks like the length of the semicircle is 3r.

10.08.2025 20:59 โ€” ๐Ÿ‘ 1    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0

This A1 stuff is really great!

08.08.2025 06:43 โ€” ๐Ÿ‘ 1    ๐Ÿ” 0    ๐Ÿ’ฌ 2    ๐Ÿ“Œ 0

I have a student teacher this year (first time in a 30 year teaching career) and I just sent him this blog entry. Iโ€™m excited!

08.08.2025 00:59 โ€” ๐Ÿ‘ 1    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

I meanโ€ฆyou arenโ€™t wrong?

08.08.2025 00:54 โ€” ๐Ÿ‘ 3    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

Ah got it. Iโ€™d still wait to hear from the math teacher. I teach algebra 2 and my dream is that all students have the same model bc it makes teacher tech support so much easier. (Also, I have never achieved this goal!)

07.08.2025 16:54 โ€” ๐Ÿ‘ 1    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0

If anything, Iโ€™d wait to see what the teacher asks students to have. Many schools supply them to students. Many teachers use only Desmos. Iโ€™d waitโ€ฆ

07.08.2025 15:54 โ€” ๐Ÿ‘ 2    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0

One of the best teacher practices I was taught is to NOT call roll on the first day. Ask students individually to say their names. That way you never say a childโ€™s name wrong.

06.08.2025 17:27 โ€” ๐Ÿ‘ 1    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

Iโ€™d like to add to the conversation that โ€œextraโ€ information in a problem is a good thing for students to grapple with.

06.08.2025 15:11 โ€” ๐Ÿ‘ 1    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0

Why why why would we be talking about nuclear developments on the moon when we canโ€™t provide healthcare for free?

05.08.2025 17:57 โ€” ๐Ÿ‘ 0    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

Questions for my students:
Paused at 1:45: how many rotations will it take before the square lands back at its original orientation (vertices in place).
At end: if the side length of the square is 3, what is the total distance traveled of the highlighted vertex?

05.08.2025 17:56 โ€” ๐Ÿ‘ 0    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

But maybe you needed to and it should have been free?

05.08.2025 17:50 โ€” ๐Ÿ‘ 66    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0

What could possibly go wrong?

05.08.2025 15:58 โ€” ๐Ÿ‘ 1    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

THIS IS THE DUMBEST TIMELINE.

03.08.2025 01:01 โ€” ๐Ÿ‘ 9    ๐Ÿ” 0    ๐Ÿ’ฌ 2    ๐Ÿ“Œ 0

โ€œSomeone much more qualifiedโ€ = sychophant white man with no credentials.

01.08.2025 18:29 โ€” ๐Ÿ‘ 0    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

Itโ€™s not his house. He just lives there for now.

01.08.2025 05:03 โ€” ๐Ÿ‘ 0    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

Question for myself: imagine the shape that would result if there was a trace on the path of the circle. Could I construct that shape with a compass and straight edge?

01.08.2025 00:57 โ€” ๐Ÿ‘ 2    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

What portion of the square never touches the circle?

31.07.2025 19:00 โ€” ๐Ÿ‘ 1    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

A question for my students: what portion of the circle is never touched by the square?

31.07.2025 19:00 โ€” ๐Ÿ‘ 1    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0

I guess I figured you had done that with careful intention. Itโ€™s delightful.

30.07.2025 13:56 โ€” ๐Ÿ‘ 0    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

One more: which is bigger? The square or the circle? Will your answer always be the same? Can you convince me?

30.07.2025 05:56 โ€” ๐Ÿ‘ 0    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

Questions for my students from this animation: if the area of the square is 16, what is the area of the circle?

Which is greater? The circumference of the circle or the perimeter of the square?

If the radius of the circle is 3, what is the area
Of the square?

30.07.2025 05:55 โ€” ๐Ÿ‘ 2    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0

So you can lie to congress and be confirmed as a judge. Cool. Cool.

30.07.2025 03:24 โ€” ๐Ÿ‘ 3    ๐Ÿ” 1    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 8

How much more evidence do we need that Republicans do not actually like America. And they certainly donโ€™t love it.

29.07.2025 20:43 โ€” ๐Ÿ‘ 0    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

Ooh ooh ooh. I know how long it is. But I want to be the captain of chaosโ€ฆ make it just a wee bit shorter!!! ;)

Ooh ooh! Then I could ask my students the question, when will it land where it started?

29.07.2025 20:41 โ€” ๐Ÿ‘ 3    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

Collins is concerned. Murkowski will say she will vote no, then vote yes, then feel betrayed.

29.07.2025 20:10 โ€” ๐Ÿ‘ 8    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

Paul Erdos and Paul Erdos after hair club for men.

27.07.2025 00:58 โ€” ๐Ÿ‘ 2    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0
Formative Assessment Lessons

www.map.mathshell.org/lessons.php

26.07.2025 21:29 โ€” ๐Ÿ‘ 1    ๐Ÿ” 0    ๐Ÿ’ฌ 0    ๐Ÿ“Œ 0

I figured it out, but if you click on the blue link you get an error. :(

26.07.2025 21:29 โ€” ๐Ÿ‘ 1    ๐Ÿ” 0    ๐Ÿ’ฌ 1    ๐Ÿ“Œ 0

The link doesnโ€™t work for me. Is it busted?

26.07.2025 21:18 โ€” ๐Ÿ‘ 0    ๐Ÿ” 0    ๐Ÿ’ฌ 2    ๐Ÿ“Œ 0

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