Shaun Errichiello
@shaunteaches.bsky.social
I teach math and I am excited about it!!!
Teaching trig on the xy plane and “All Students Take Calculus” came up. I’m ready for a new phrase. I’ll have a contest with my students to create their own phrases.
Any ideas?
#iteachmath
#edusky
#MtBoS
#trigonometry
Any ideas?
#iteachmath
#edusky
#MtBoS
#trigonometry
November 12, 2025 at 3:07 PM
Teaching trig on the xy plane and “All Students Take Calculus” came up. I’m ready for a new phrase. I’ll have a contest with my students to create their own phrases.
Any ideas?
#iteachmath
#edusky
#MtBoS
#trigonometry
Any ideas?
#iteachmath
#edusky
#MtBoS
#trigonometry
Anyone else still using chalk? I am one of the last at my high school and love it.
If only I had sliding boards…one can dream.
#hagoromo
#iTeachMath
#MathSky
If only I had sliding boards…one can dream.
#hagoromo
#iTeachMath
#MathSky
November 10, 2025 at 5:14 PM
Anyone else still using chalk? I am one of the last at my high school and love it.
If only I had sliding boards…one can dream.
#hagoromo
#iTeachMath
#MathSky
If only I had sliding boards…one can dream.
#hagoromo
#iTeachMath
#MathSky
Get to teach completing the square tomorrow with a Geometric perspective!
Using this from Jamie Smith
#MtBoS
#ITeachMath
#EduSky
www.geogebra.org/m/kTEjFHJw
Using this from Jamie Smith
#MtBoS
#ITeachMath
#EduSky
www.geogebra.org/m/kTEjFHJw
Completing the Square Visualisation
A simple visualisation tool to help students visualise the process of completing the square and understand the origins of the name of the process.
www.geogebra.org
November 10, 2025 at 1:45 AM
Get to teach completing the square tomorrow with a Geometric perspective!
Using this from Jamie Smith
#MtBoS
#ITeachMath
#EduSky
www.geogebra.org/m/kTEjFHJw
Using this from Jamie Smith
#MtBoS
#ITeachMath
#EduSky
www.geogebra.org/m/kTEjFHJw
Shared this proof of Heron's formula today while playing symphony no. 9. I faded in the steps to the music and then had students discuss the steps. It was fun!
Proof: shorturl.at/VYMT3
Slides: kntn.ly/d34ef3ce
Music: kntn.ly/16e69aa3
#MtBoS
#iTeachMath
#EduSky
Proof: shorturl.at/VYMT3
Slides: kntn.ly/d34ef3ce
Music: kntn.ly/16e69aa3
#MtBoS
#iTeachMath
#EduSky
Dvořák: Symphony №9, "From The New World" - II - Largo
YouTube video by diesillamusicae
www.youtube.com
November 7, 2025 at 3:11 PM
Shared this proof of Heron's formula today while playing symphony no. 9. I faded in the steps to the music and then had students discuss the steps. It was fun!
Proof: shorturl.at/VYMT3
Slides: kntn.ly/d34ef3ce
Music: kntn.ly/16e69aa3
#MtBoS
#iTeachMath
#EduSky
Proof: shorturl.at/VYMT3
Slides: kntn.ly/d34ef3ce
Music: kntn.ly/16e69aa3
#MtBoS
#iTeachMath
#EduSky
Excited to show the Geometry of the difference of squares tomorrow!
I am using this Geogebra graph as a guide:
www.geogebra.org/m/GwA3J77g
#Mtbos
#iTeachMath
#Geogebra
I am using this Geogebra graph as a guide:
www.geogebra.org/m/GwA3J77g
#Mtbos
#iTeachMath
#Geogebra
Difference of Squares
Difference of Squares
www.geogebra.org
November 6, 2025 at 4:01 AM
Excited to show the Geometry of the difference of squares tomorrow!
I am using this Geogebra graph as a guide:
www.geogebra.org/m/GwA3J77g
#Mtbos
#iTeachMath
#Geogebra
I am using this Geogebra graph as a guide:
www.geogebra.org/m/GwA3J77g
#Mtbos
#iTeachMath
#Geogebra
I appreciate that my student has brought Redbull to the AMC math competition. That is dedication. 😀
#Redbull
#iTeachMath
#Redbull
#iTeachMath
November 5, 2025 at 5:55 PM
I appreciate that my student has brought Redbull to the AMC math competition. That is dedication. 😀
#Redbull
#iTeachMath
#Redbull
#iTeachMath
(2/2) When I use paper to track retakes:
1) It encourages conversation. Students come up and sign up. We chat. It’s great.
2) It requires intent. There is something special (still) about signing your name.
3) It’s easy to track and annotate. The binder is right there. I can mark easily.
1) It encourages conversation. Students come up and sign up. We chat. It’s great.
2) It requires intent. There is something special (still) about signing your name.
3) It’s easy to track and annotate. The binder is right there. I can mark easily.
November 4, 2025 at 4:01 AM
(2/2) When I use paper to track retakes:
1) It encourages conversation. Students come up and sign up. We chat. It’s great.
2) It requires intent. There is something special (still) about signing your name.
3) It’s easy to track and annotate. The binder is right there. I can mark easily.
1) It encourages conversation. Students come up and sign up. We chat. It’s great.
2) It requires intent. There is something special (still) about signing your name.
3) It’s easy to track and annotate. The binder is right there. I can mark easily.
(1/2) I spent a long time setting up a digital system for tracking and encourage test retakes. I used it for years, especially since 2020, but this year I went low tech: but paper and a binder. It has been fantastic.
#MathSky
#iTeachMath
#MathSky
#iTeachMath
November 3, 2025 at 10:10 PM
(1/2) I spent a long time setting up a digital system for tracking and encourage test retakes. I used it for years, especially since 2020, but this year I went low tech: but paper and a binder. It has been fantastic.
#MathSky
#iTeachMath
#MathSky
#iTeachMath
(2/2) Seeing students apply their ideas to algorithms is still one of the best aspects of teaching. Here is the student algorithm that I was able to share back with the class today. Sometimes long division is a better choice than synthetic division! Also, these topics rule.
#MathSky #iTeachMath
#MathSky #iTeachMath
October 28, 2025 at 2:02 AM
(2/2) Seeing students apply their ideas to algorithms is still one of the best aspects of teaching. Here is the student algorithm that I was able to share back with the class today. Sometimes long division is a better choice than synthetic division! Also, these topics rule.
#MathSky #iTeachMath
#MathSky #iTeachMath
(1/2) Aren't students amazing? I showed how to use synthetic division to factor a polynomial. The first question I get is about how to avoid synthetic division and use long division! Then I realized I had a similar question three years ago! Here is the original approach:
#MathSky #iTeachMath
#MathSky #iTeachMath
October 28, 2025 at 2:00 AM
(1/2) Aren't students amazing? I showed how to use synthetic division to factor a polynomial. The first question I get is about how to avoid synthetic division and use long division! Then I realized I had a similar question three years ago! Here is the original approach:
#MathSky #iTeachMath
#MathSky #iTeachMath
Found a phone outside a local barbershop. The owner sent their son to get it. He was my student!
We said hello and then I sat down to get my haircut. The barber was also my former student!
Feeling lucky to have made so many connections over the years.
#MathSky
#iTeachMath
We said hello and then I sat down to get my haircut. The barber was also my former student!
Feeling lucky to have made so many connections over the years.
#MathSky
#iTeachMath
loT.mm
March 19, 2025 at 12:53 AM
Found a phone outside a local barbershop. The owner sent their son to get it. He was my student!
We said hello and then I sat down to get my haircut. The barber was also my former student!
Feeling lucky to have made so many connections over the years.
#MathSky
#iTeachMath
We said hello and then I sat down to get my haircut. The barber was also my former student!
Feeling lucky to have made so many connections over the years.
#MathSky
#iTeachMath
Has anyone tried the PicoCalc? It looks cool and I was thinking of trying it out.
www.tomshardware.com/raspberry-pi...
#Mtbos
#iTeachMath
www.tomshardware.com/raspberry-pi...
#Mtbos
#iTeachMath
Raspberry Pi Pico powers $75 PicoCalc portable programming handheld
It may be clockwork, but this is no wind up
www.tomshardware.com
March 15, 2025 at 11:35 PM
Has anyone tried the PicoCalc? It looks cool and I was thinking of trying it out.
www.tomshardware.com/raspberry-pi...
#Mtbos
#iTeachMath
www.tomshardware.com/raspberry-pi...
#Mtbos
#iTeachMath
March 15, 2025 at 2:22 AM
Anyone else getting ads like this?
By the way…I like when kids ask “when will we use this?” It is a great conversation starter!!
#iteachmath #mtbos
By the way…I like when kids ask “when will we use this?” It is a great conversation starter!!
#iteachmath #mtbos
February 12, 2025 at 1:05 AM
Anyone else getting ads like this?
By the way…I like when kids ask “when will we use this?” It is a great conversation starter!!
#iteachmath #mtbos
By the way…I like when kids ask “when will we use this?” It is a great conversation starter!!
#iteachmath #mtbos
December 9, 2024 at 9:46 PM
Took a little poll in class today. So far only 1 student is all in for Tau.
Where do you stand?
#ITeachMath #MathSky #EduSky
Where do you stand?
#ITeachMath #MathSky #EduSky
December 9, 2024 at 4:53 PM
Took a little poll in class today. So far only 1 student is all in for Tau.
Where do you stand?
#ITeachMath #MathSky #EduSky
Where do you stand?
#ITeachMath #MathSky #EduSky
Proved the sine and cosine sum formulas today! #Mtbos #iTeachMath
November 20, 2024 at 9:41 PM
Proved the sine and cosine sum formulas today! #Mtbos #iTeachMath
@drussellpsu.bsky.social
I actually use your animations in my high school precalculus class! Thank you for all the brilliant work you do.
#iTeachMath
I actually use your animations in my high school precalculus class! Thank you for all the brilliant work you do.
#iTeachMath
November 20, 2024 at 1:38 PM
@drussellpsu.bsky.social
I actually use your animations in my high school precalculus class! Thank you for all the brilliant work you do.
#iTeachMath
I actually use your animations in my high school precalculus class! Thank you for all the brilliant work you do.
#iTeachMath
Proving the angle sum and difference with sine and cosine tomorrow and just found this gem on Trigonography.
trigonography.com?p=70
I haven't seen it before and prefer it to some other proofs I have used.
Has anyone else used this? Do you have any that you prefer? #mtbos #iTeachMath
trigonography.com?p=70
I haven't seen it before and prefer it to some other proofs I have used.
Has anyone else used this? Do you have any that you prefer? #mtbos #iTeachMath
November 20, 2024 at 2:17 AM
Proving the angle sum and difference with sine and cosine tomorrow and just found this gem on Trigonography.
trigonography.com?p=70
I haven't seen it before and prefer it to some other proofs I have used.
Has anyone else used this? Do you have any that you prefer? #mtbos #iTeachMath
trigonography.com?p=70
I haven't seen it before and prefer it to some other proofs I have used.
Has anyone else used this? Do you have any that you prefer? #mtbos #iTeachMath
Just constructed all 6 trig ratios on a unit circle and my students were PUMPED! I also surprised them with large wooden chalk compass!
After, we looked at a dynamic construction on Geogebra. I hope it helps them develop a visual sense of these ratios!
#trig
After, we looked at a dynamic construction on Geogebra. I hope it helps them develop a visual sense of these ratios!
#trig
November 16, 2024 at 2:56 AM
Just constructed all 6 trig ratios on a unit circle and my students were PUMPED! I also surprised them with large wooden chalk compass!
After, we looked at a dynamic construction on Geogebra. I hope it helps them develop a visual sense of these ratios!
#trig
After, we looked at a dynamic construction on Geogebra. I hope it helps them develop a visual sense of these ratios!
#trig
I am really excited to try out this platform and see such a wonderful community of educators here! You are all so awesome!
November 16, 2024 at 2:15 AM
I am really excited to try out this platform and see such a wonderful community of educators here! You are all so awesome!