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Todd Feitelson πŸ’ Profile
Todd Feitelson πŸ’

@toddf9

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9-12 Math Teacher. Algebra 2, AP Calculus, Geometry. Wolfram Innovator Award 2019. Fun Fact: My Dad was Martin Gardner’s accountant. He/Him #MTBoS

Millbrook, NY
Joined March 2009
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@toddf9
Todd Feitelson πŸ’
9 months
@RochelleTelfer Pirate game day 2024!
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@toddf9
Todd Feitelson πŸ’
1 year
@Desmos 3D is live! I've been waiting for this! I took a student project from Algebra 2 that is from another platform and imported it to desmos. It's done using systems of inequalities. Very accessible! #Desmos3D
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@toddf9
Todd Feitelson πŸ’
1 year
Another close one
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@toddf9
Todd Feitelson πŸ’
2 years
My AirPlay code was oh-so-close to the β€œI’ll buy you all pizza” number.
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@toddf9
Todd Feitelson πŸ’
1 year
I could spend a full week in class on this cartoon. #NoticeWonder
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@toddf9
Todd Feitelson πŸ’
2 years
@mrdardy @KarenCampe That’s where I stopped reading for about a year. But my daughter encouraged me to finish it so I did and I’m glad I did.
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@toddf9
Todd Feitelson πŸ’
2 years
@mrdardy @KarenCampe Yeah, it was the same with me I think, but I coach, love and play hockey. That made me uncomfortable too. In the end, though, I felt like the book shared my sensibilities. I’d be curious what you think if you make it through the book.
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@toddf9
Todd Feitelson πŸ’
2 years
@mrdardy @KarenCampe I actually stopped reading it at some point, maybe where you are. It was kind of upsetting and seemed like it might move in a clichΓ© direction. But - I came back to it, and I actually found it dealt with some difficult issues pretty well. The sequel is on my list for this summer
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@toddf9
Todd Feitelson πŸ’
2 years
@bowmanimal Reminds me of this old Car Talk episode.
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@toddf9
Todd Feitelson πŸ’
2 years
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@toddf9
Todd Feitelson πŸ’
2 years
Every auto-biography should end β€œβ€¦.and then I sat down to write this.”
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@toddf9
Todd Feitelson πŸ’
2 years
My AirPlay code was oh-so-close to the β€œI’ll buy you all pizza” number.
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@toddf9
Todd Feitelson πŸ’
2 years
@suffolkmaths Fine question. Here’s a summary in a tweet. Glad to add more if needed.
@toddf9
Todd Feitelson πŸ’
4 years
@shirky17 @mathhombre Yes. Recorded video. Projected and marked ball at three spots. Projected @desmos grid on board. Used coordinates to find a,b and c (solved system using matrices). Plotted and traced equation. Replayed video. Voila! #LessonInATweet
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@toddf9
Todd Feitelson πŸ’
2 years
β€œWhen the math is over”
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Todd Feitelson πŸ’
2 years
@DavidKButlerUoA @jamestanton Intermediate Value theorem! Related to one of my favorites: at any given moment there are two antipodal points on the globe with the same temperature.
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@toddf9
Todd Feitelson πŸ’
2 years
@joshuazucker @KarenCampe @mrdardy I agree - it's different than "the set of all points where the function is increasing" (which is not something we typically ask about.) I really, really like the subtlety in these definitions - I think they're kind of beautiful. And yet, very unimportant at HS level at least.
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@toddf9
Todd Feitelson πŸ’
2 years
For teachers, today is the Sundayest of all the Sundays.
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@toddf9
Todd Feitelson πŸ’
2 years
@mrdardy IMO, it's highly pedantic, pretty unnecessary to beat kids up with, but it does speak to the importance of detail in definitions. I believe the AP in these cases is even accepting of either the open or closed interval as a correct solution.
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