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davidpetro314.bsky.social
DavidPetro314
@davidpetro314.bsky.social
390 followers 150 following 96 posts
I am tribal. Math is one of my tribes & so is Ironman Triathlon. Though here I only post about Math & Science. Oame PastPresident Desmos Fellow #MTBoS
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davidpetro314.bsky.social
DavidPetro314 @davidpetro314.bsky.social · Nov 24
The #math community seems to be growing here and becoming more active. I have presented on how to get the most of being in a community like this many times and here are my tips to grow this PLN and make it useful for educators.

Bonus Tip - Use the Feeds:
#MathChat #MTBoS #iTeachMath #MathSky
Tips to move beyond a “lurker” (and/or start to interact with the Online Math Community) Like - Who benefits: You (it acts like a bookmark) & the Poster (“Yay someone liked what I said”) Repost - Who benefits: You (it acts like a bookmark), the Poster (“Wow, they liked enough to share it”) & the rest of us (Reposting sends it back to the top of the feed increasing the chance of your followers and their followers to see it) Comment - Who benefits: You (interaction brings more friends and knowledge), the Poster (the conversation they started continues) & us (entices us to become part of the conversation too) Post - Who benefits: You (sharing thoughts and resources help to hone your own ideas) & Everyone else (the more discussion, the higher the chance we all learn) Tips for making your Posts more visible: Add an image - including a visual has been shown to increase the interaction Include hashtags (not too many) - a hashtag categorizes your Post and makes it visible to a wider audience than just your followers. Here are some math related hashtags that relate to education: #MathChat #MathsChat #MTBoS #iTeachMath #ElemMathChat #MathArt #MathSky Tag some people (not too many) - you can tag relevant people (even those who don’t follow you) in the Post or in the Image to increase the conversation potential
Reposted by DavidPetro314
benjamindickman.bsky.social
new CollectEdNY blog pot from Mark Trushkowsky!
www.collectedny.org/2026/01/slow...

#iTeachMath ♾️
see posts below ⬇️
January 23, 2026 at 8:35 PM
Reposted by DavidPetro314
curiouspolymath.bsky.social
#mathsky
January 21, 2026 at 2:51 PM
Reposted by DavidPetro314
johngolden.bsky.social
via my favorite librarian www.dear-data.com/theproject pretty amazing #mathart #dataviz project
THE PROJECT — Dear Data
www.dear-data.com
January 19, 2026 at 7:07 PM
davidpetro314.bsky.social
[New Post] Ontario Math Links - My favourite #math related links from this week:

ontariomath.blogspot.com/2026/01/math...

links and help from @theericklee.bsky.social @momath.bsky.social @howiehua.bsky.social @afetter29.bsky.social @mathowitz.bsky.social & more #MathChat #MTBoS #iTeachMath
January 18, 2026 at 4:35 PM
Reposted by DavidPetro314
afetter29.bsky.social
Here’s an addition to #NoticeWonder. #ElemMathChat
January 16, 2026 at 2:15 AM
Reposted by DavidPetro314
howiehua.bsky.social
Let's learn how to factor quadratics where the leading coefficient isn't 1 without guessing and checking.

(Okay I know that sounds boring but I like this video lol)
January 15, 2026 at 5:21 PM
Reposted by DavidPetro314
mathowitz.bsky.social
How to divide a number by 5.

Double the number.
Move the decimal place one unit to the left.

You're welcome.

4283/5

8566
856.6

It's *magic*

(and i'm sure it has nothing to do with the fact that 5=10/2 😜)
January 16, 2026 at 6:26 PM
Reposted by DavidPetro314
theericklee.bsky.social
Monthly Mind-benders puzzles from Peter Winkler and @3blue1brown.com! A great team together with @momath.bsky.social. The first puzzle is out now. #ITeachMath momath.org/mindbenders/
momath.org
January 16, 2026 at 7:44 PM
davidpetro314.bsky.social
[New Post] Ontario Math Links - My favourite #math related links from this week:

ontariomath.blogspot.com/2026/01/math...

Links and help from @karencampe.bsky.social @tbrzezinski.bsky.social @amplifyeducation.bsky.social @ahestenes.bsky.social @priy45hah.bsky.social
#MathChat #MTBoS #iTeachMath
Math Links for Week Ending Jan 9th, 2025
Featured Links I have been a Desmos Fellow (now Amplify Fellow) since 2018 and it has given me resources, insight and inspiration. And don't...
ontariomath.blogspot.com
January 11, 2026 at 5:46 PM
Reposted by DavidPetro314
priy45hah.bsky.social
Natures strength or a parabola 🤔
#MathsToday ❄️
January 6, 2026 at 9:49 PM
Reposted by DavidPetro314
ahestenes.bsky.social
In #MathsToday I had all the students at the whiteboards and asked them to solve ax^2+bx+c=0 by completing the square. They were so surprised to get the quadratic formula as their answer, and then they were proud they had derived this mystical formula without even realizing they were doing it.
a heart with the words " quadratic formula my beloved " written on it
Alt: a heart gif opens up with the words " quadratic formula my beloved " written on it
media.tenor.com
January 7, 2026 at 11:56 PM
Reposted by DavidPetro314
karencampe.bsky.social
New blog post: "Go For Geometry! 8 Congruence Motions" using translation and reflection tools in dynamic #geometry technology.
#MTBoS #iTeachMath #T3Learns #MathsToday

karendcampe.wordpress.com/2026/01/08/g...
Go For Geometry! 8
Using Dynamic Technology to Build Understanding ◊ Episode 8: Congruence Motions◊ It’s time for congruent triangles in Geometry class! One of my favorite ways to get students prepared for the congru…
karendcampe.wordpress.com
January 8, 2026 at 12:29 PM
Reposted by DavidPetro314
benjamindickman.bsky.social
I did this fellowship under its slightly different name last summer. It was a great opportunity to hang with some dope people for a day and a half and to get plugged in with new resources/networks thereafter.

Applications are open now!
amplify.com/amplify-clas...

cc #iTeachMath ♾️

📣
January 9, 2026 at 12:27 AM
Reposted by DavidPetro314
tbrzezinski.bsky.social
Exploring rotations in the coordinate plane: drive.google.com/file/d/1maRA... & youtube.com/shorts/g31aC... @desmos.com #MTBoS #ITeachMath #edusky #mathteacher
January 9, 2026 at 5:40 PM
davidpetro314.bsky.social
[New Post] Ontario Math Links - My favourite #math related links from this week:

ontariomath.blogspot.com/2026/01/math...

Links and help from @karencampe.bsky.social @johngolden.bsky.social @helsig.bsky.social
and more #MathChat #MTBoS #iTeachMath
January 4, 2026 at 6:16 PM
Reposted by DavidPetro314
johngolden.bsky.social
Miko Imura/Hirono Tyle shared a blogpost on this cool heptagon based #tessellation. note.com/tairu_mk/n/n... (in Japanese, but translates well.)
正7角形を並べてみると？──普通の会社員がarXivに論文を投稿する1年前の話｜平野たいる｜MathKonnect
こんにちは、平野たいる（@tairu_mk）です。 前回の記事は、初投稿ながら想像を遥かに超える反響をいただき、ありがとうございました。本稿において前提としている部分もあるため、未読の方はそちらを先に読んでいただけますと幸いです。 また、前回の記事がきっかけとなり、arXivに投稿した論文の解説記事がITmediaに掲載される運びとなりました。重ねてありがとうございます。 日本の会社...
note.com
January 2, 2026 at 11:32 PM
davidpetro314.bsky.social
[New Post] Ontario Math Links - My favourite #math related links from this week:

ontariomath.blogspot.com/2025/12/math...

Links and help from @pwharris.bsky.social @stevenstrogatz.com @howiehua.bsky.social and more #MathChat #MTBoS #iTeachMath
December 28, 2025 at 10:59 PM
Reposted by DavidPetro314
johngolden.bsky.social
#playfulmath carnival 183! mathhombre.blogspot.com/2025/12/play... Writing on teaching, fun math, puzzles, games, art...
Playful Math Carnival 183
Welcome to the 183rd edition of the Playful Math Carnival. Begun by Denise Gaskins, previously known as Math Teachers at Play. If you'd be i...
mathhombre.blogspot.com
December 27, 2025 at 2:22 AM
davidpetro314.bsky.social
[New Post] Ontario Math Links - My favourite #math related links from this week:

ontariomath.blogspot.com/2025/12/math...

links and help from @fawnnguyen.substack.com @desmos.com @howiehua.bsky.social @bobsonwong.com and more #MathChat #MTBoS #iTeachMath
December 21, 2025 at 8:56 PM
Reposted by DavidPetro314
bobsonwong.com
Bad math #MTBoS #ITeachMath
atrupar.com Aaron Rupar @atrupar.com · Dec 18
FOX: If you cut something by 100%, the cost goes down to 0. If you cut it by 600%, the drug companies are actually paying you

LUTNICK: What he's saying is if a drug was $100 and you bring it down to $13, it's down 7 times

F: Not a 600% cut

L: But it's 700% higher price before. It's down 700% now
December 19, 2025 at 11:20 AM
Reposted by DavidPetro314
desmos.com
Have some free time over the next couple weeks? You have less than a month to submit your work to the Desmos Art Contest! Head to desmos.com/art for more information, and be sure to hit submit before January 15th, 2026. #mathsky #iteachmath
A black background with a glowing purple wireframe sphere tilted in perspective. Centered on the sphere is white and purple text reading “desmos ✨ art contest 2025.” A soft gray triangular spotlight shines downward to the lower right.
December 19, 2025 at 9:28 PM
davidpetro314.bsky.social
[New Post] Ontario Math Links - My favourite #math related links from this week:

ontariomath.blogspot.com/2025/12/math...

Links and help from @howiehua.bsky.social @karencampe.bsky.social @ganeshuor.bsky.social and more #MathChat #MTBoS #iTeachMath
December 14, 2025 at 11:01 PM
Reposted by DavidPetro314
karencampe.bsky.social
Here's the December Calendar of Problems from 40 years ago... the first year of the calendar format!!

Enjoy #ProblemSolving this month yourself or w/students; share thinking here or on the post.

#MTBoS #iTeachMath #T3Learns #MathsToday #RecreationalMath

karendcampe.wordpress.com/2025/12/01/d...
December Calendar Problems
The year is flying by and December is upon us! I had planned to share a December calendar of problems from the early 2000s, but I was digging around and realized that 2025 is the 40th anniversary o…
karendcampe.wordpress.com
December 1, 2025 at 2:03 PM
davidpetro314.bsky.social
[New Post] Ontario Math Links - My favourite #math related links from this week:

ontariomath.blogspot.com/2025/12/math...

Links and help from @amplifyeducation.bsky.social @themathguru.bsky.social @mikejacobs.bsky.social @howiehua.bsky.social @ganeshuor.bsky.social and more
December 7, 2025 at 2:26 PM
Reposted by DavidPetro314
mikejacobs.bsky.social
I came across a really nice way of visually showing the sum of the first n square numbers. Details in this blog:
themathguy.blogspot.com/2025/11/the-...
The Sum of the First n Square Numbers
One of the things I like to do as a teacher is provide visual proofs of why certain formulas work. A nice one that I use a lot in high scho...
themathguy.blogspot.com
November 10, 2025 at 3:57 PM