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John Hartmann @jhartedu.bsky.social · 8d

Maximum post, sir!

John Hartmann @jhartedu.bsky.social · Sep 5

#RSDMathRocks #RSDMathIntervention

Sara Van Der Werf @saravanderwerf.bsky.social · Sep 5

The 8 SMP's are new in MN so we are creating lots of resources. If you want a refresh, check out our stuff. Today we released a free resource anyone can use (K-2 3-5 6-8 HS & educators) to notice the assets of others engaging in the SMPs. Learn more here: www.youtube.com/watch?v=2NS_...

FREE RESOURCE for the 8 Mathematical Practices from the MN Math Leaders

YouTube video by MN Council of Teachers of Mathematics (MCTM)

www.youtube.com

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John Hartmann @jhartedu.bsky.social · Sep 3

Thanks to our local Scooters for supporting teachers.
Much appreciated.

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Reposted by John Hartmann

Howie Hua @howiehua.bsky.social · Sep 1

It's Mental Math Monday! How would you mentally calculate 15×24?

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John Hartmann @jhartedu.bsky.social · Sep 3

First thought was to break 15 into 10 and 5. But then I noticed both were great candidates for double/halve. 30x12 is easier but I repeat the d/h to get 60x6. Now I'm working with a known square 6x6 is 36 and shift place value since it's 6 tens. 360.

John Hartmann @jhartedu.bsky.social · Sep 1

#RSDMathRocks
#RSDMathIntervention

drnickinewton.bsky.social @drnickinewton.bsky.social · Sep 1

When kids subtract from teen numbers:
🖐 Feel it (manipulatives)
👀 See it (take ones away)
✏️ Symbolize it (write equation)
That hands → eyes → brain path makes subtraction stick! #primaryteachers #primaryschool #firstgrade #firstgradeteachers #secondgrade #subtractionstrategies #homeschooling

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Reposted by John Hartmann

Duane Habecker @duanehabecker.com · Aug 28

Today I helped some teachers come to grips with the fact that their 4th grade math textbook has many lessons that are NOT 4th grade standards.

Not only does the book NOT advocate good teaching...it is also teaching the wrong stuff.

#CMCforQualityMath
#UseHQIM

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Reposted by John Hartmann

Melynee Naegele @mnmmath.bsky.social · Aug 25

📢 #ElemMathChat is back! Sept–May lineup features Joanna Hayman, Dr. Nicki Newton, Marria Carrington, Naomi Dupre-Edelman, Dr. India White, Dee Crescitelli, Jaliyla Fraser & more. Check out the lineup: bit.ly/466q4lf
We still have open dates Sign up to lead here: docs.google.com/spreadsheets...

Chat PR 25/26

September 4, 2025: Joanna Hayman 📢 #ElemMathChat is back! First chat of the year: Please join us in discussing, Students with disabilities & meaningful math as a human right. With @joannahayman.bsk...

bit.ly

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Reposted by John Hartmann

drnickinewton.bsky.social @drnickinewton.bsky.social · Aug 24

👀 Dab, grab, and shout hooray—
Number sense is built this way! 🎉
Bingo dots make math a game,
Number play will never be the same!
#MathFun #EarlyMath

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Reposted by John Hartmann

Grassroots Workshops @grassrootsworkshops.com · Aug 15

If you're a math teacher looking to incorporate an exciting math routine or problem to use with your students, check out our mini workshops from these math educators.

Learn more at grassrootsworkshops.com/wor...

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John Hartmann @jhartedu.bsky.social · Aug 10

Happy birthday sir. Hope it is great.

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Reposted by John Hartmann

EducationPlus @educationplusstl.bsky.social · Aug 8

Welcome Neighbor STL seeks volunteer tutors for weekly 1-hr in-home English lessons with refugee women in St. Louis.

No experience needed—training & materials provided.
Sign up: bit.ly/4g6pCmC #ELL #STLedu

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John Hartmann @jhartedu.bsky.social · Jul 23

#RSDMathRocks
#RSDMathIntervention

drnickinewton.bsky.social @drnickinewton.bsky.social · Jul 23

youtu.be/RuoQVGTGifc?... 🎯"Why bridge through 10?" Because 9 + 7 is a drama queen... but 10 + 6 is chill. Teach the strategy, not just the sum. #MathFluency #mathfactfluency #primaryschoolteacher #primaryschool #mathcoach

Bridging ten card game. #mathshorts #mathfluency

YouTube video by Nicki Newton

youtu.be

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Reposted by John Hartmann

Howie Hua @howiehua.bsky.social · Jul 5

A math "trick" that can make subtraction easier:

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John Hartmann @jhartedu.bsky.social · Jul 5

We use this a lot but never considered it with mixed numbers. Always learning. Thank you

John Hartmann @jhartedu.bsky.social · Jun 24

Not totally free, but free-ish, Padlet I think has something called Sandbox. Similar to Jamboard. Can have three boards for free I believe.

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John Hartmann @jhartedu.bsky.social · Jun 23

(20×8)-16
160-10-6
150-6
144

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John Hartmann @jhartedu.bsky.social · Jun 20

It might just be the associative property talking, but I think we should pair up...

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John Hartmann @jhartedu.bsky.social · Jun 18

Weird... but I'm having a harder time than I probably should be reconciling this. I can see it but...

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Reposted by John Hartmann

Sue O'Connell @sueoconnellmath.bsky.social · Jun 13

I hope you will join us throughout the summer for this slow chat on strengthening k-5 students’ number skills and number sense. Begins June 16 in the Math in Practice/Sue O’Connell Facebook group. @nctm.org @mathedleaders.bsky.social @heinemannpub.bsky.social #elemmathchat

Sue O'Connell @sueoconnellmath.bsky.social · Jun 3

Join our summer slow chat and gather ideas for deepening K-5 students' numeracy skills. Each Monday from June 16 to July 21 a question will be posted. No need to register, just jump into the Facebook group any time that week to add a comment or read others' ideas. www.facebook.com/groups/Mathi...

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Reposted by John Hartmann

Howie Hua @howiehua.bsky.social · Jun 4

As a math teacher, it feels like half of my job is building mathematical confidence. Here are some ways I do this:

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John Hartmann @jhartedu.bsky.social · Jun 3

Had fun at our district math PD. What's wrong with me... it's summer. 🤣

John Hartmann @jhartedu.bsky.social · Jun 1

Situational... if it cost me $ I'd round down. If it profited me, round to 1. If I was being offered 0.49999 of a brownie, up to 1 full piece. 0.49999 of a brussel sprout, down to 0 thanks. 😁

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Reposted by John Hartmann

compasspd.bsky.social @compasspd.bsky.social · May 30

In this episode of the Compass PD Podcast, Dr. Stephanie Brenner and Dr. Stephanie Evans take a deep dive into the complexities of dyscalculia—a learning difference that affects students' ability to understand and work with numbers.

youtu.be/E6uOZLF-9RA

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John Hartmann @jhartedu.bsky.social · May 26

I like working with 10% as a base. I added 4+5 to make certain 45 was easily divisible by 3. 15 is 10%. So 45 is 30% of 150.