Math Links for Week Ending Mar 25th, 2022

Featured Links

You know, sometimes you have seen something your whole life and not really noticed it and then someone comes along to point directly at it and you think "yup, that is cool"
Curriculum Tags: Gr8, MTH1W
https://twitter.com/howie_hua/status/1506785311904321539

New TikTok video: Can I just say how beautiful the decimal representation of sevenths is? pic.twitter.com/Daz2Os0qiX

— Howie Hua (@howie_hua) March 24, 2022

Resource Links

I think we may all have seen this development of the area of a circle but it is nice to have a concise play by play like the one given in this @MathisVisual post. 
Curriculum Tags: Gr7, Gr8
https://mathisvisual.com/area-of-a-circle/

Video Links

More from @Howie_Hua here in this video where he talks about why we don't need common denominators when we multiply fractions. Often students do this because they had it hammered into their heads with adding fractions. It's not wrong to do but it's not necessary. That being said, it's actually helpful to get common denominators when dividing fractions. 
Curriculum Tags: Gr8
https://twitter.com/howie_hua/status/1506064111263629317

New TikTok video: Why don't we need common denominators when multiplying fractions? pic.twitter.com/wMTD2cdC6a

— Howie Hua (@howie_hua) March 22, 2022

Image Links

A lot of @Howie_Hua this week but, hey, when the stuff is good, it's good. I could see doing this with terms related to each grade level or course. 
Curriculum Tags: All
https://twitter.com/howie_hua/status/1507491790999281670

Find your birthday and describe what your (possibly) new math term might look like. pic.twitter.com/kr7i92Aljf

— Howie Hua (@howie_hua) March 25, 2022

    

Math Links for Week Ending Mar 18th, 2022

Featured Links

As one of the organizers of the OAME 2022 conference I'm excited about our slate of keynote and featured speakers. On the latest @OAMEtalks podcast they all answer the question "What did you do while online that you will continue to do as we move to more face to face?". Have a listen and then register for the conference. More info here http://oame2022.ca/ 
Curriculum Tags: All
https://talks.oame.on.ca/season-4

Resource Links

A tough @OpenMiddle problem for solving systems of equations. Though I wonder if approaching this from a graphical perspective might make it easier.
Curriculum Tags: MPM2D
https://twitter.com/robertkaplinsky/status/1504951537206013980

Can your Algebra students create a a system of three equations with a solution at (1, 1)? Try out this challenging@openmiddle problem from @Audrey_Mendivil, @danluevanos, and me with them. https://t.co/fL1rSJLZPx #iteachmath pic.twitter.com/PJ65qzWXrf

— Robert Kaplinsky (@robertkaplinsky) March 18, 2022

A bunch of PiDay resources in this thread for you to bookmark for next year
Curriculum Tags: All
https://twitter.com/MathigonOrg/status/1501564476994342919

Next Monday, March 14, is both Pi Day and the International Day of Mathematics! This thread contains many free resources from Mathigon which you can use to celebrate this wonderful day. #PiDay @idm314 🧵 pic.twitter.com/H0c77xYQSw

— Mathigon (@MathigonOrg) March 9, 2022

Video Links

PiDay was last Monday so there was no shortage of stuff including this connection to music
Curriculum Tags: All
https://www.youtube.com/watch?v=JXyO8GB_mkw

I did some work showing something similar in this @Desmos activity but this video does a nice job of explaining why you can't use SSA (in general). 
Curriculum Tags: Gr7, Gr8
https://twitter.com/howie_hua/status/1504963107075997698

New TikTok video: Why is there no SSA triangle congruence? pic.twitter.com/umY5JJje26

— Howie Hua (@howie_hua) March 18, 2022

Image Links

Geometry is everywhere and beautiful
Curriculum Tags: All
https://twitter.com/GeomeTribal/status/1505117868928688129

The stunning 12-pointed star ceiling at Fin Garden, a historical Persian garden in Kashan, Iran. (Zoom in to see the details)

Photo: Amir Pashaei pic.twitter.com/q3ARY03cQO

— Ancient Geometry (@GeomeTribal) March 19, 2022

The requisite PiDay humour

Curriculum Tags: All
https://twitter.com/patel_abha/status/1503323046349791232

Happy Pi Day!! #piday2022 pic.twitter.com/4uGt4T7Lad

— Abha Patel (@patel_abha) March 14, 2022

I love that this seemingly surprising equality actually has an algebraic solution that clears up the mystery

Curriculum Tags: MTH1W
https://twitter.com/intelocode/status/1502510318333083655

Actually, infinitely many such equations can be framed.

We can start with unknown values x, y & z.
I'm not mentioning every step rigorously here, but it's enough to figure out.

The final equation on left implies x=y and z=x²-1.
Hence, we get values for all x>1 pic.twitter.com/o8DKe8fO0j

— Abhishek Verma 💻 (@intelocode) March 12, 2022

    

Math Links for Week Ending Mar. 11th, 2022

Featured Links

A worked example is the bread and butter of a math teacher and it has been for years. Of course, if you are heavy into the  Thinking Classroom then you might not think so anymore but I think that this post about how to make kids think while still showing worked examples starts to create a bridge between a traditional and a thinking classroom. 
Curriculum Tags: All
https://twitter.com/mpershan/status/1498092968082874368

We all can think of teachers who just talk talk talk talk while boring everyone to bits. That's bad. Meanwhile, research in favor of explicit teaching piles up.

What sort of explicit teaching actually works? Here's an essay where I make sense of this: https://t.co/nWKFooeWBf

— Michael Pershan (@mpershan) February 28, 2022

Resource Links

As I do every Pi Day (week), I feature my Pinterest page that houses all of my Pi Day resources. Videos, images, activities, etc.  And I always highlight that the Rolling Stones logo has Pi right on the tongue. 
Curriculum Tags: All
https://www.pinterest.ca/davidpetro314/pi-day/

I like the idea of visually seeing the effects of the positions of the points on the standard deviation and this interactive from @TimBrzezinski does that trick
Curriculum Tags: MDM4U
https://twitter.com/TimBrzezinski/status/1498271253291057152

Standard Deviation: Quick intuitive intro and exploration. Here, the length of either pink arrow represents the SD of this data set. What do you notice? What do you wonder? https://t.co/FL9AG5DxRT @geogebra #MTBoS #ITeachMath #statistics pic.twitter.com/qvbFUYGrWU

— Tim Brzezinski (@TimBrzezinski) February 28, 2022

I love this activity that combines some of the mechanics of Pascal's triangle and adding polynomials. I could see it used for other polynomial related operations too. 
Curriculum Tags: Gr7, Gr8, MTH1W
https://twitter.com/msbjacobs/status/1498035255978217477

I was in a Grade 9 class on Friday and gave them this task which gave them lots of opportunities to show their algebraic thinking. More details in this blog post: https://t.co/JGgzMRKXaX pic.twitter.com/QzCGFDckyg

— Michael Jacobs (@msbjacobs) February 27, 2022

You'll find this and many other activities at the link. 
Curriculum Tags: All

https://www.draustinmaths.com/algebra

⭐️ New Resources ⭐️
Finding the Equation of a Straight Line from its Graph. Two levels - integer gradients and fractional gradients. https://t.co/03Dc1xV0NP #mathsresources #mathschat #mathscpdchat pic.twitter.com/9fvtwtBzz0

— Amanda Austin (@draustinmaths) February 27, 2022

I continue to be impressed with all the interactives that are coming out of @Mathigon
Curriculum Tags: Gr7, Gr8
https://twitter.com/MathigonOrg/status/1498312261080920070

Swapping the position of faces and vertices in a polyhedron creates its “dual.” Here you can see that a dodecahedron and a icosahedron are dual. What is the dual of a cube? Learn more and explore for yourself at https://t.co/hIBPvrwn1w#math #mtbos #mathchat #edchat #duals pic.twitter.com/jxZPLzM3yP

— Mathigon (@MathigonOrg) February 28, 2022

Video/Audio Links

My PiDay Ignite video that I show each year
Curriculum Tags: All
https://www.youtube.com/watch?v=UBpw9TuzxtU

In honour of Pi Day, there are two math related stories on @TheStoryColider. Check this out and all the other Math related podcasts on my curated math podcast page. 
Curriculum Tags: All
http://ontariomath.blogspot.com/p/podcasts.html

Image Links

I have seen many versions of this clock but not with 9s yet. 
Curriculum Tags: All
https://twitter.com/pickover/status/1498125736745521158

Mathematics.

Amazing clock made of all 9s. Source: https://t.co/SYy9RiDSu4 pic.twitter.com/1UwKBZL6N5

— Cliff Pickover (@pickover) February 28, 2022

This seems to go hand in hand with the above clock of 9s

Curriculum Tags: Gr7, Gr8, MTH1W

https://twitter.com/howie_hua/status/1498446301117104132

I *think* I created a new puzzle?

(a) Find expressions that equal 1 through 10 w/out moving anything. Each expression needs at least 2 numbers in it.
(b) Create an expression where you can find expressions equal to 1 through 10 in it. What's the least number of numbers needed? pic.twitter.com/j3mdcs8UFj

— Howie Hua (@howie_hua) February 28, 2022

Fibonacci and Nachos, of course

Curriculum Tags: All
https://twitter.com/pickover/status/1498078357618970625

This humor involves mathematics and food. https://t.co/l5DsafClWr pic.twitter.com/1FfLxbVsEp

— Cliff Pickover (@pickover) February 27, 2022

And perhaps where this came from
Curriculum Tags: All
https://twitter.com/dpscher/status/1500503390685745158

I suspect this joke began here. pic.twitter.com/lqG1FrAgzv

— Daniel Scher (@dpscher) March 6, 2022

   

Math Links for Week Ending Mar. 4th, 2022

Featured Links

This got reposted this week and I relistened to it and it wasn't terrible: -)
Curriculum Tags: All
https://twitter.com/davidpetro314/status/1497978515970568204

1/3 Ok, so I reluctantly listened to this @MakeMathMoments episode again since it was re shared and I stand by everything I said. The online #math community is awesome and here are some ways to make the most of it...#MathChat #MTBoS #iTeachMath https://t.co/fmRnAAXaVA

— David Petro (@davidpetro314) February 27, 2022

Resource Links

Such a nice mash up of percents and marbleslides. 
Curriculum Tags: Gr7, Gr8, MTH1W
https://twitter.com/TimBrzezinski/status/1497779524796354562

Estimating percentages in a @Desmos Marbleslides & slope setting: httpths://t.co/H08fjLaFd5. @AlgebraDesmos #MTBoS #ITeachMath #math pic.twitter.com/brEcedv8pS

— Tim Brzezinski (@TimBrzezinski) February 27, 2022

I love #MenuMath and here is a new one for multiplying fractions 

Curriculum Tags: Gr7, Gr8
https://twitter.com/NatBanting/status/1497690793288638465

Another new #MenuMath today. @KirstDy's Multiplying Fractions Menu.
(inspired by @davidpetro314's Adding Fractions Menu)

Both here: https://t.co/lhwCWeZiFv #MTBoS #iteachmath

— Nat Banting (@NatBanting) February 26, 2022

Video Links

I think that students would be into this since the context is a testing situation. 
Curriculum Tags: MDM4U
https://twitter.com/howie_hua/status/1498465368264028161

New TikTok video: You forgot there was a quiz. What's the probability of passing by just guessing? pic.twitter.com/yI0ZkcGJa9

— Howie Hua (@howie_hua) March 1, 2022

Who doesn't like intersecting planes
Curriculum Tags: MCV4U
https://twitter.com/MagicPi2/status/1498568779705552900

Twelve rhombuses in a cube
Resource: https://t.co/fD1Asw2qEI#mtbos #iteachmath #Math #Maths pic.twitter.com/9PZFNYNCdh

— Idan Tal (@MagicPi2) March 1, 2022

Image Links

This is neat looking and I like how there are three solutions. 
Curriculum Tags: MCR3U
https://twitter.com/pickover/status/1497644873247244291

Mathematics.

A mathematician emerges from a cave, hands you the slip of paper below, and asks "What is the value for x?" What is your response? pic.twitter.com/6yo5Zobgbg

— Cliff Pickover (@pickover) February 26, 2022