Math Links for Week Ending Sept. 6th, 2019

Featured Links
School has been starting in many districts now for weeks. But with Labour Day passing, I think we've all started now. One thing I will be focussing on in my new school of grade 7&8s is basic skills. Beyond the regular curriculum that needs to be taught I want teachers to continually provide activities so students can practice their numeracy skills. These Math Flips from @BerkleyEveret are a great way to rethink the idea of a flash card.
Curriculum Tags: All
https://mathvisuals.wordpress.com/math-flips/

22 decks on addition, subtraction, and multiplication within 100. Each deck is a bunch of portable number talks!

Free at: https://t.co/YmaFoPqcW2 #elemmathchat #mtbos #iteachmath pic.twitter.com/7jqPXMXFXt

— Berkeley Everett (@BerkeleyEverett) September 1, 2019

Resource Links
I am curious how you would use this to "cause a headache" for students to give them a reason to learn trig. Thanks to @Joe_Sisco for pointing this one out.
Curriculum Tags: MPM2D, MFM2P, MCF3M, MCR3U, MBF3C
https://twitter.com/psmithdad/status/1169675631530921984

Ss will try making these to estimate right angle trig unknowns. Avoiding SOH CAH TOA and creating a headache that will be cured by trig functions. pic.twitter.com/TDb6qqauU2

— Phil Smith (@psmithdad) September 5, 2019

Opinion Links
In this post, @MarkChubb3 takes a look at how important multiple solutions are but only if we understand the strength of each solution (and the pitfalls of only showing students the "best" solution.

"While multiple strategies are helpful to know, it is important for US to know which strategies are early understandings, and which are more sophisticated.  WE need to know which students to push and when to allow everyone to do it THEIR way, then hold a math congress together to discuss relationships between strategies, and which strategies might be more beneficial in which circumstance."

Curriculum Tags: All
https://buildingmathematicians.wordpress.com/2019/09/04/the-more-strategies-the-better/

Video Links
I remember as a kid, the teacher telling us the "trick" about greater than or less than by considering the alligator's mouth without worrying about understanding. This video from @BerkleyEveret does a great job of visualizing their meanings without a trick.
Curriculum Tags: All
https://twitter.com/BerkeleyEverett/status/1167615042977554433

New visual, inspired by the May 2019 @TCM_at_NCTM article by @LiversStefanie, Kristin Harbour, and Lindsey Fowler, which includes suggestions on conceptual ways to teach the comparison symbols (instead of crocodile mouths).

Video available at: https://t.co/prm1qx30ob#mtbos pic.twitter.com/EsCK6DCSAT

— Berkeley Everett (@BerkeleyEverett) August 31, 2019

I don't seem to get tired of these dynamic bar graphs of "popularity" of what ever happens to be the flavour of the day. In this case, browser popularity.
Curriculum Tags: MDM4U
https://twitter.com/ericcurts/status/1167812867065884673

📊 Usage Share of Internet Browsers 1996 - 2019 https://t.co/mWMXPvxW9r Who remembers Netscape Navigator Gold? #edtech #GoogleEDU #GSuiteEDU #GoogleChrome pic.twitter.com/N4NNa8cOVh

— Eric Curts (@ericcurts) August 31, 2019

I know this is an animation but I still really like it. A lot of math going on. Especially trig
Curriculum Tags: MCR3U
https://twitter.com/ZonePhysics/status/1168282576458588160

This is so cool 🙂 pic.twitter.com/aC3zLh5IB8

— Physics & Astronomy Zone (@ZonePhysics) September 1, 2019

I love these animations where what seems to be complex motion can have a hidden simpler motion embedded. In this case some sinusoidal motion along a straight line.
Curriculum Tags: MCR3U
https://twitter.com/doubleroot/status/1168908542759358474

Made a little animation🙂 (using @geogebra)
The Copernicus Theorem - lesson coming soon.#Math #Geometry #iTeachMath #MTBoS pic.twitter.com/439j51pZa5

— Vaibhav Sawhney (@doubleroot) September 3, 2019

I don't think you will have students looking for some of these but it's a great crossover between computing and mathematics dealing with powers and integers.
Curriculum Tags: All
https://www.youtube.com/watch?v=zyG8Vlw5aAw

Image Links
Another reason that you shouldn't resort to "Tricks" - they expire. Thanks to @HThiesmejer for pointing this one out.
Curriculum Tags: MPM1D, MFM1P
https://twitter.com/QueenMel99/status/1167560147088105472

Saw this in one of our textbooks...I think a part of me just died 🤦🏾‍♀️.#cpsmathandme#iteachmath @ddmeyer pic.twitter.com/IE4L8gNiPB

— Melissa Kincaid (@QueenMel99) August 30, 2019

I wonder what the thinking is hear?
Curriculum Tags: Gr7, Gr8, MPM1D, MFM1P
https://twitter.com/Trianglemancsd/status/1168595759337496578

Possibly the least necessary ratio table ever. #unitratechat @mnstatefair pic.twitter.com/ShLknn5QVQ

— Christopher Danielson (@Trianglemancsd) September 2, 2019

I continue to like @MonaChalabi's style and choice of subject area for her visualizations.
Curriculum Tags: MDM4U
https://www.instagram.com/p/B1eTZp4FrOd/

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Change is happening but it’s slow and it’s unequal. Posting this today because it’s black women’s equal pay day. It’s on August 22 because it takes full-time black women workers 234 days to catch up with what their white men colleagues earned in 2018 alone. Source: US Bureau of Labor Statistics

A post shared by Mona Chalabi (@monachalabi) on Aug 22, 2019 at 9:46am PDT