#iteachmath🧮
have you seen this result?
www.desmos.com/calculator/8...

if not... can you prove it? #iTeachTrig 📐

RESULT
for A, B, C that sum to 180° (e.g. interior angles of a triangle):

sin²(A) =
sin²(B) + sin²(C) - 2cos(A)sin(B)sin(C)

#MathSky 🧮 #iTeachMath ♾️
Desmos | Graphing Calculator
www.desmos.com
December 21, 2025 at 1:17 AM
December 19, 2025 at 4:20 PM
December 19, 2025 at 12:00 AM
MAT 655 ss @lehmancollege.bsky.social used different #EdTech platforms to tackle the Aug25 NYS Algebra Regents. Ss also created their own #MathArt using different functions & parameters #MathPlay 🧮

#ITeachMath #MTBoS #EduSky #MathsToday #MathSky #EdChat #STEM @desmos.com @ticalculators.bsky.social
December 16, 2025 at 11:26 PM
Facilitating #MathPlay 🧮 doesn't imply learning less rigorous #math @iborganization.bsky.social ss applied their knowledge of functions to create their own @strangerthings.bsky.social #MathArt🎨 via @desmos.com

#MTBoS #ITeachMath #MathsToday #STEM #EdTech #EdChat #MathSky #StrangerThings #EduSky
December 15, 2025 at 4:31 PM
December 6, 2025 at 6:26 PM
Find an 8 digit calculator word (rotate 180° and read the digits as letters) whose middle four digits (without rotation) are consecutive integers.

I believe there is a unique solution and/but would be happy to be proved wrong!

#iTeachMath ♾️ #MathSky 🧮
December 4, 2025 at 12:09 AM
Work Problems are more fun with 6 and 7 🤷🏽‍♂️ and 42 🐋🪴
#MathSky 🧮
#iteachmath
#EduSky
If it takes Elmo 6 minutes to build a snowman and Rocco 7 minutes to build a snowman, how fast can they build a snowman if they worked together?
December 3, 2025 at 7:28 PM
Today Stats ss got to #MathPlay 🧮 with "Can you guess the correlation?" Such an engaging and fun @mathmedic.bsky.social lesson. The highlight of today "Correlation Doesn't Imply Causation" #ITeachMath #MTBoS #EdTech #MathSky #MathsToday #EduSky #Math #Maths

🔗👇
www.rossmanchance.com/applets/2021...
December 3, 2025 at 6:51 PM
Tuesday #MathPlay 🧮 - Snowflakes during the #snowday ❄️🌨️

#ITeachMath #MTBoS #MathSky #ElemMathChat #MathsToday #EduSky

📖🔗👇
www.amazon.com/Math-Play-Li...
December 2, 2025 at 6:04 PM
lol at the answer being "Yes"

click thru to see more!
#iTeachMath ♾️ #MathSky 🧮
Does anyone know of a Christmas-themed activity on loci in the complex plane?

Bit niche, I know, but surely *someone* has made one.

#ALevelMaths #UKMathsChat
November 29, 2025 at 11:57 PM
November 29, 2025 at 4:44 PM
Even though the text itself is (mostly) finished, there are still lots of things to add! Textbooks *should* be good teaching and learning resources, so this one will have lots of extras to share with people to use (or change) as they want!

#MathSky 🧮
#iTeachMath
November 22, 2025 at 9:10 PM
Today STEP ss at Mercy University got to create some turkey #MathArt via @geogebra.org Classroom #MathPlay 🧮🦃👩‍🎨

#ITeachMath #MTBoS #EduSky #MathSky #MathsToday #EdChat #EdTech #MathArt #Math
November 22, 2025 at 5:14 PM
consider a subset of the first N positive integers:
S ⊆ {1, ..., N}

call S "mid" if, for every integer n, if n-1 and n+1 are elements of S, then n is in S.

#MathSky 🧮 #iTeachMath ♾️

example: if N=5, the set {2,3,4,5} is a mid subset.

⭐️ find a formula f(N) for the # of mid subsets of {1, ..., N} ⭐️
November 22, 2025 at 2:32 PM
in base 10, sometimes two numbers with only 0s and 1s have a product of only 0s and 1s. e.g.
11010*100001 = 1101011010

➡️ under what conditions does this occur?

cc #MathSky 🧮 bcc #iTeachMath ♾️
November 19, 2025 at 11:26 PM
new NEW @cshor.org pset 🥳

🔗:
drive.google.com/file/d/1mk6R...

alt text:
Screenshots of pages 1, 2, 3, and 7 (first three & last)

I haven't even read the problems but I cosign/cosine them nevertheless

#iTeachMath ♾️ #MathSky 🧮
November 13, 2025 at 8:52 PM
Feeling grateful to share that over 5000 #math educators have registered for “Facilitating #MathPlay 🧮 with @geogebra.org Classroom" @makemathmoments.bsky.social Virtual Summit👨‍💻👩‍🏫

#mmmsummit2025 #ITeachMath #MTBoS #EduSky #MathSky #MathsToday

Register 🆓👇
summit.makemathmoments.com?sc=1doA9beS&...
November 12, 2025 at 11:32 PM
who is more likely to win, according to your intuition, in a game of war?

Scenario 1:

Player A with 4 aces
Player B with the other 48 cards

Scenario 2:

Player A with 4 aces and 4 kings
Player B with the other 44 cards

cc #iTeachMath ♾️ #MathSky 🧮
November 7, 2025 at 6:31 PM
find x such that |x|<1 is a solution to:
1/(1+x²) = 6sin(x)

screenshot of WolframAlpha approximation below...

notice it ends with 11 7 2025, which is TODAY'S DATE

coincidence?! #iTeachMath ♾️ #MathSky 🧮


PS: what equation could you use for tomorrow's date?
November 7, 2025 at 2:31 PM
Tonight calc ss @lehmancollege.bsky.social started class with a #SameDiffMath activation routine comparing two Power Rules💪🦾 #MathPlay 🧮

#ITeachMath #MTBoS #MathsToday #EduSky #MathSky #ThinkingClassrooms #BuildingThinkingClassrooms #Math
November 6, 2025 at 11:31 PM