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Mandy Jansen

@mandymathed.bsky.social
1.8K followers 1K following 453 posts

Professor of mathematics education at the University of Delaware's School of Education. Former middle school mathematics teacher in Arizona. I wrote a book called Rough Draft Math: Revising to Learn. (Obviously, all views are my own.)

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Mandy Jansen @mandymathed.bsky.social · 09/10/2026
This book looks great! And any folks local to the Philly area -- this book launch sounds like a great event.
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Mandy Jansen @mandymathed.bsky.social · 17/12/2025
Went to Longwood Gardens last night. It was lovely to see it lit up with snow on the ground.
Snow on the ground. A tree covered with lights, lit up at night.
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Mandy Jansen @mandymathed.bsky.social · 23/11/2025
Worth waiting a year for Part 2! Such a gorgeous film - Wicked: For Good!
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Mandy Jansen @mandymathed.bsky.social · 23/11/2025
An event where the line for the men’s restroom is longer than the women’s? Hockey. Go Flyers!
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Mandy Jansen @mandymathed.bsky.social · 16/10/2025
At the NCTM research conference, @meg-botello.bsky.social and I presented about a mathematics teacher’s incorporation of drafting and revising into an Illustrative Mathematics lesson.
Two women smiling on either side of an academic poster.
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Mandy Jansen @mandymathed.bsky.social · 16/10/2025
I did not know that Family Feud was filmed in Atlanta when I created a Family Feud game for my NCTM burst session to present in ATL! Do you have any answers to the question?
What opportunities are present in curriculum materials to engage students in drafting and revising?Family Feud signDescribes game rules, but the larger point is that everyone wins just by sharing ideas.8 options!
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Mandy Jansen @mandymathed.bsky.social · 14/10/2025
I so appreciated the community who attended our session: How can math class save democracy? Thanks to @cluzniak.bsky.social for being an amazing collaborator for our session at @mathedleaders.bsky.social #NCSMRiseUp
Chris Luzniak and Mandy Jansen in front of a title slide that says, how can math class save democracy?Group selfie! An “ussie”
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Mandy Jansen @mandymathed.bsky.social · 13/10/2025
Looking forward to presenting on Tuesday, Oct 14, at 2:15 pm @mathedleaders.bsky.social with @cluzniak.bsky.social!
Two smiling friends!How can math class save democracy? See Chris Luzniak and Mandy Jansen co-present at NCSM on Tuesday, Oct 14, at 2:15 pm
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Mandy Jansen @mandymathed.bsky.social · 13/10/2025
I loved Vanessa and Peter’s session at #NCSMRiseUp ! Who knew that Orange and Pink would go so well together. 💕🧡 @themathguru.bsky.social
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Mandy Jansen @mandymathed.bsky.social · 28/05/2025
Are you a middle school mathematics teacher who has read Rough Draft Math or would like to? If so, would you like to be in a research study? You do not have to live in Delaware Please email me or DM me! Please share!
Seeking middle school mathematics teachers who are interested in rough draft math -- reflect on your teaching, video record your teaching, survey your students about their motivation and engagement. $800 for the year if you participate.
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Mandy Jansen @mandymathed.bsky.social · 27/04/2025
Celebrate my birthday (4/27) by donating! Here is a direct link if you want to donate to support my research group: givingday.udel.edu/giving-day/9... Your generosity will pay middle school teachers for their time that they sprend learning together about rough drafting and revising in math class.
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Mandy Jansen @mandymathed.bsky.social · 27/04/2025
It is my birthday! Maybe you would consider supporting my research team? givingday.udel.edu/giving-day/9...
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Mandy Jansen @mandymathed.bsky.social · 08/02/2025
Integrating Torres’s Rights of the Learner into mathematics classrooms (and living them out) honors our students’ identities and helps us truly see and hear one another. ❤️
The right to be confused. The right to claim a mistake and revise your thinking. The right to speak, listen, and be heard. The right to write, do, and represent what makes sense to you. The right to be safe and respected.
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Mandy Jansen @mandymathed.bsky.social · 06/02/2025
At AMTE, Lateefah Id-Deen asked us to share an image, meme, or gesture that illustrates a non-transactional relationship. This is what I shared.
“Change the way you look at things and the things you look at change.” One person sees a symbol as a 6 and the other person sees the same symbol as a 9.
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Mandy Jansen @mandymathed.bsky.social · 02/02/2025
Happy to be attending a screening of the film "Counted Out." www.countedoutfilm.com
logo of film titled "Counted Out" also says "math is power" - a film by Vicki Abeles
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Mandy Jansen @mandymathed.bsky.social · 31/01/2025
Saw this chaotic display at an antique shop in Provo, Utah, on Tuesday.
A group of naked kewpie dolls in a glass case.
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Mandy Jansen @mandymathed.bsky.social · 26/01/2025
From my airplane window as I landed in Provo, Utah. ✈️
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Mandy Jansen @mandymathed.bsky.social · 07/12/2024
Winter sunset @drteyar.bsky.social’s house!
Orange sunset and trees in the silhouette
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Mandy Jansen @mandymathed.bsky.social · 06/12/2024
New article announcement: Along with Meg Botello and @elenamsilla.bsky.social, we write about small changes that teachers reported in their after participating in a conference presentation about rough draft math (see figure below). (Alt text restates ideas in figure.) www.mdpi.com/2227-7102/14...
After attending a conference, teachers' thinking shifted to understand the value of revising, that students can learn while making mistakes, that teachers can intentionally use language while teaching to promote drafting and revising, that peer collaboration supports revising, that rough drafting and revising can happen in math (not just language arts), and that rough drafting and revising in mathematics class is feasible to implement.
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Mandy Jansen @mandymathed.bsky.social · 02/12/2024
Thanks to my boyfriend, Mark, for these flowers! 🌹 Two years together! ♥️
Square short glass clear vase with about 16 short stemmed red roses on a wooden table
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Mandy Jansen @mandymathed.bsky.social · 29/11/2024
My niece, Kate, navigates the world in a wheelchair. Yesterday she told me how one of her teachers has a poster that says that everyone belongs in that classroom. She said that the poster is not true. The room is set up so that Kate cannot get around in it very well. (Kate is in sixth grade.)
Photo of an 11 year old girl in a wheelchair wearing yellow crocs, black pants, a University of Delaware blue hens t-shirt, and sunglasses. She is making a peace sign with two fingers.
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Mandy Jansen @mandymathed.bsky.social · 29/11/2024
It is with a heavy heart that I share that my dear sister, Laura Anne Ellersick, passed away suddenly at her home on Tuesday, November 26, 2024. She was 47 years old. www.giveinkind.com/inkinds/N7A0... We have set up a site to support her husband, Chris, and her daughter, Kate (age 11).
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Mandy Jansen @mandymathed.bsky.social · 25/11/2024
Good morning from the beach!
Sunrise over the Atlantic Ocean
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Mandy Jansen @mandymathed.bsky.social · 18/11/2024
A little treat I like to give myself is to take the train into NYC (from Wilmington, DE), have a yummy lunch, catch a matinee, walk around the city, get dinner at the train hall, and head back! I am going back on December 8 to see Maybe Happy Ending with Darren Criss! What do you do for a treat?
A picture of Times Square at dusk with white and black artwork on the ground.
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Mandy Jansen @mandymathed.bsky.social · 17/11/2024
In Hell’s Kitchen to see this show - off Broadway. Peep the cast: mcctheater.org/tix/shit-mee...
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Mandy Jansen @mandymathed.bsky.social · 16/11/2024
Nature is beautiful! Look at the hexagons! (Photo courtesy of Charles Hohensee.)
Two wasps' nests. Light brown. One shows the inside with lots of hexagonal shapes.
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Mandy Jansen @mandymathed.bsky.social · 15/11/2024
In the hallways at the University of Delaware… made by one of my colleagues, Charles Hohensee, and his doctoral students.
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Mandy Jansen @mandymathed.bsky.social · 14/11/2024
Hi! I teach a math for teachers class. This is a double number line diagram that a student used to solve a partial groups division problem (2 and 1/4 divided by 3/5) from class today! #iteachmath #MTBoS
Picture of a double number line to solve: I have 2 and 1/4 cups of sugar. This makes 3/5 of a batch. How many cups do I need for one batch?
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Mandy Jansen @mandymathed.bsky.social · 07/11/2024
Cinnamon roll bigger than your face! @mathematize4all.bsky.social at Sherman’s in Palm Springs, CA
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Mandy Jansen @mandymathed.bsky.social · 25/08/2024
Math teachers - would you like to be paid to participate in a focus group or survey about how you use data to improve your teaching? Please complete this Google Form if you have ANY interest at all: tinyurl.com/FocusGroupOr... Please repost!
This graphic requests for math teachers to volunteer to participate in a focus group or survey about how they use data to improve their teaching. http://tinyurl.com/focusgrouporsurvey
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Mandy Jansen @mandymathed.bsky.social · 19/05/2024
Pinball Saturday!
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Mandy Jansen @mandymathed.bsky.social · 28/03/2024
I am looking forward to giving a research colloquium at the University of Maryland tomorrow!
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Mandy Jansen @mandymathed.bsky.social · 16/03/2024
What comes to mind when you think about humanizing mathematics, teaching, and learning? These words came from participants at the Conversations among Colleagues conference (Michigan affiliate of the Association of Mathematics Teacher Educators).
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Mandy Jansen @mandymathed.bsky.social · 05/03/2024
This happened!
Photo of a plaque awarding Amanda Jansen for excellence in scholarly community engagement.
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Mandy Jansen @mandymathed.bsky.social · 01/03/2024
New stickers!
Two stickers that say Rough Draft Math with crumpled graph paper in the background.
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Mandy Jansen @mandymathed.bsky.social · 23/02/2024
Happy to be on my way to L.A. and psyched to open the CPM teacher conference (cpm.org/teacher-conf...) tomorrow with a keynote and then a breakout session after lunch. There are many ways that the CPM curriculum materials and Rough Draft Math are a great pairing!
Smiling woman’s face, long blonde hair and glasses.
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Mandy Jansen @mandymathed.bsky.social · 04/01/2024
I asked Bing Image Creator for an image of a happy woman being a mathematics teacher. I didn't expect a kid's hand up giving the teacher the middle finger!
A woman with glasses smiling and writing on a chalkboard. The chalkboard has math symbols. One of the student's hands is raised with its middle finger in the air!
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Mandy Jansen @mandymathed.bsky.social · 08/12/2023
Here are my students' (undergraduate teacher candidates) ideas about what their middle school mathematics methods course taught them this semester. What do you notice? What do you wonder?
An image of a Jamboard of ideas about teaching mathematics related to creating productive classroom culture, professional growth, collaboration among colleagues, and effective mathematics teaching practices.
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Mandy Jansen @mandymathed.bsky.social · 12/11/2023
Proud to say that I had my best finish ever in a pinball tournament tonight! 48 women and nonbinary players competed at the lavish Delaware Pinball Collective. My friends in this picture are my Ball Buster friends from the Pinball Gallery In Malvern, PA. (I’m on the right among the bottom 3 people.)
A list of the top 16 players in a pinball tournament. Mandy is placed 8th!A group of women are smiling in front of pinball machines.
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Mandy Jansen @mandymathed.bsky.social · 07/11/2023
How many?
Rows of slices of cake in a vending machine. Some slices are rainbow colored. Some look like they are chocolate. Some look like they are vanilla.
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Mandy Jansen @mandymathed.bsky.social · 04/11/2023
Fun to watch this game (76ers versus Suns) in person this afternoon!
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Mandy Jansen @mandymathed.bsky.social · 29/10/2023
I was fortunate to get to present today at NCSM. I have attached my title slide and anonymous participants’ reflections. The prompt was “I used to think… and now I think…” I spoke about understanding different ways teachers enact rough draft math by listening to their stories about their histories.
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Mandy Jansen @mandymathed.bsky.social · 28/10/2023
So is math!
Art is an invitation to experience the world from someone else’s point of view.
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Mandy Jansen @mandymathed.bsky.social · 25/10/2023
Loved @mathematize4all.bsky.social’s session at #NCTMDC23 research conference! She shared the danger of focusing only on the deficits of students identified with special needs and the divides between special education research and mathematics education research.
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Mandy Jansen @mandymathed.bsky.social · 19/10/2023
hi! If you're coming to NCTM, please join me on Thursday, 10/26/23, from 9:30 - 10:30 am in Ballroom A of the convention center in D.C. For more information, see the images!
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Mandy Jansen @mandymathed.bsky.social · 17/10/2023
New haircut - fresh for NCTM next week! 😄
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Mandy Jansen @mandymathed.bsky.social · 12/10/2023
I think I'm going to go to the National Zoo on Wednesday morning of NCTM week in D.C. The pandas are about to leave and go to China, and I want to visit them. (I did not register to attend the research conference this year.) This is a random share from me!
Giant panda eating a stick of bamboo
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