Sara Van Der Werf
@saravanderwerf.bsky.social
Math Teacher & sometimes leader. Connecter. Evangelist for Math. MN gal. Curator of a Calculator Museum. Backwards Bike rider. Want to be a writer and creator again. Love connecting with Math Peeps. Links: https://linktr.ee/saravanderwerf
My coworker Mike is a new mathematician today.
October 17, 2025 at 2:39 PM
My coworker Mike is a new mathematician today.
Seen @nctm.org this morning. I’m not there but my coworker Mike is. Say Hi to him. #iteachmath
October 16, 2025 at 12:41 PM
Seen @nctm.org this morning. I’m not there but my coworker Mike is. Say Hi to him. #iteachmath
Hey Math Friends in Atlanta. I am not there, but so jealous. Can you post pics of the sessions you attend and people and slides and...let me have an at home experience. Also, look for my MN friends there. Hang out with them. (also look for my coworker Mike Huberty in costume)
October 15, 2025 at 7:09 PM
Hey Math Friends in Atlanta. I am not there, but so jealous. Can you post pics of the sessions you attend and people and slides and...let me have an at home experience. Also, look for my MN friends there. Hang out with them. (also look for my coworker Mike Huberty in costume)
I turned 57 today! All previous posts connect to this number. Happy Thursday all. (just humoring myself)
September 18, 2025 at 8:42 PM
I turned 57 today! All previous posts connect to this number. Happy Thursday all. (just humoring myself)
I know some of you have been wondering about my posts in the last 12+ hours. I am just humoring myself. But I know some of you are worried - here is my proof - within a couple of hours I received these texts from my sister, brother and mom. More soon to connect all the previous posts today.
September 18, 2025 at 8:40 PM
I know some of you have been wondering about my posts in the last 12+ hours. I am just humoring myself. But I know some of you are worried - here is my proof - within a couple of hours I received these texts from my sister, brother and mom. More soon to connect all the previous posts today.
Yes I made a homemade ‘Happy Perfect Square Day!’ pin to wear today. Do something that involves a right triangle today & let me know what it is. #iteachmath #mathstoday
September 16, 2025 at 1:12 PM
Yes I made a homemade ‘Happy Perfect Square Day!’ pin to wear today. Do something that involves a right triangle today & let me know what it is. #iteachmath #mathstoday
1 day! Does it have to be squares off of each side of the triangle? Also, my nephews at ages 3, 4 and 5. Enjoy. #iteachmath #mathstoday #mtbos docs.google.com/document/d/1...
September 15, 2025 at 2:19 PM
1 day! Does it have to be squares off of each side of the triangle? Also, my nephews at ages 3, 4 and 5. Enjoy. #iteachmath #mathstoday #mtbos docs.google.com/document/d/1...
Correlation? Causation?
September 11, 2025 at 10:59 PM
Correlation? Causation?
What math task? What math context? should make it into the K-12 Math Hall of Fame? Let's hear your choices! #mtbos #iteachmath #mathstoday
September 11, 2025 at 7:03 PM
What math task? What math context? should make it into the K-12 Math Hall of Fame? Let's hear your choices! #mtbos #iteachmath #mathstoday
9 days until Perfect Square Day! I know 9/9/25 is a perfect square, but 9/16/25 hits a bit different as it connects with a 3/4/5 right traingle. On another note, I made my nephews pose for this pic when the turned ages 3, 4 & 5.
Download a countdown HERE: docs.google.com/document/d/1...
Download a countdown HERE: docs.google.com/document/d/1...
September 7, 2025 at 7:23 PM
9 days until Perfect Square Day! I know 9/9/25 is a perfect square, but 9/16/25 hits a bit different as it connects with a 3/4/5 right traingle. On another note, I made my nephews pose for this pic when the turned ages 3, 4 & 5.
Download a countdown HERE: docs.google.com/document/d/1...
Download a countdown HERE: docs.google.com/document/d/1...
It is a dream come true. I am now a math instructor at the University of Minnesota! Ski-U-Mah!
I didn't get a job here or anything. I'm just a math instructor physically on their campus.
#HappyBdayHowie
#HowieHuaAppreciationDay @howie_hua
I didn't get a job here or anything. I'm just a math instructor physically on their campus.
#HappyBdayHowie
#HowieHuaAppreciationDay @howie_hua
August 10, 2025 at 1:54 PM
It is a dream come true. I am now a math instructor at the University of Minnesota! Ski-U-Mah!
I didn't get a job here or anything. I'm just a math instructor physically on their campus.
#HappyBdayHowie
#HowieHuaAppreciationDay @howie_hua
I didn't get a job here or anything. I'm just a math instructor physically on their campus.
#HappyBdayHowie
#HowieHuaAppreciationDay @howie_hua
Happy Pythagorean Triple Day! -with a throw back pic of my nephews when their ages were 3, 4 & 5.
July 24, 2025 at 11:49 PM
Happy Pythagorean Triple Day! -with a throw back pic of my nephews when their ages were 3, 4 & 5.
MCTM's YouTube Channel Hit 500 subscribers today! Have you subscribed yet? I've put up over 20+ videos in the last year. We expect to put up 50+ videos in the 2025-26 school year. Subscribe today! www.youtube.com/@executivedi... #mathstoday #iteachmath #mtbos
July 14, 2025 at 8:00 PM
MCTM's YouTube Channel Hit 500 subscribers today! Have you subscribed yet? I've put up over 20+ videos in the last year. We expect to put up 50+ videos in the 2025-26 school year. Subscribe today! www.youtube.com/@executivedi... #mathstoday #iteachmath #mtbos
Sometimes you do things to make only yourself smile and you don’t care if anyone notices. Today my jewelry has the following polygons: triangle, quadrilateral, pentagon, hexagon and octagon. I need to find jewelry with heptagons, nonagons, decagons…
July 7, 2025 at 7:26 PM
Sometimes you do things to make only yourself smile and you don’t care if anyone notices. Today my jewelry has the following polygons: triangle, quadrilateral, pentagon, hexagon and octagon. I need to find jewelry with heptagons, nonagons, decagons…
It’s great to know that kids are still turning calculators upside down to make words on calculators. The number 8008 can not be too far behind…you will know it when they start to 376616. #iteachmath
May 8, 2025 at 1:44 PM
It’s great to know that kids are still turning calculators upside down to make words on calculators. The number 8008 can not be too far behind…you will know it when they start to 376616. #iteachmath
Did you know MN's own Ben Orlin made 'Math With Bad Drawing' styled images for the 8 Mathematical Practices (thanks to @mctm_mn )? He also added texts to each. You can find MN versions of his work and how to use them to unpack standards HERE: drive.google.com/drive/u/1/fo... #iteachmath #mathstoday
April 17, 2025 at 6:09 PM
Did you know MN's own Ben Orlin made 'Math With Bad Drawing' styled images for the 8 Mathematical Practices (thanks to @mctm_mn )? He also added texts to each. You can find MN versions of his work and how to use them to unpack standards HERE: drive.google.com/drive/u/1/fo... #iteachmath #mathstoday
What would go on a 'Retro Edition' Teacher version of this?
(btw - my number on the one below is so low, I thought I would need to start using negative numbers) #mathsteacher #iteachmath
(btw - my number on the one below is so low, I thought I would need to start using negative numbers) #mathsteacher #iteachmath
April 5, 2025 at 5:01 PM
What would go on a 'Retro Edition' Teacher version of this?
(btw - my number on the one below is so low, I thought I would need to start using negative numbers) #mathsteacher #iteachmath
(btw - my number on the one below is so low, I thought I would need to start using negative numbers) #mathsteacher #iteachmath
My brother had an out of state work trip and surprise dropped off a treat we can’t get here to each family member when he got home. Do you know what this is? (Hint: my family is Dutch) Excited to enjoy my treat.
February 5, 2025 at 1:50 AM
My brother had an out of state work trip and surprise dropped off a treat we can’t get here to each family member when he got home. Do you know what this is? (Hint: my family is Dutch) Excited to enjoy my treat.
Filling out a work survey today. I entered a new age band. (it feels like I should retire). Only one more age band to go in my lifetime after this.
January 27, 2025 at 9:26 PM
Filling out a work survey today. I entered a new age band. (it feels like I should retire). Only one more age band to go in my lifetime after this.
These are before/after pics she shared today of her home.
January 16, 2025 at 2:50 AM
These are before/after pics she shared today of her home.
Here was his great math Let’s put more of this on TV. Shout out to MN Sarah Carter for finding this.
December 5, 2024 at 3:10 AM
Here was his great math Let’s put more of this on TV. Shout out to MN Sarah Carter for finding this.
MP1 #iteachmath
“Even if I get it wrong, I want kids at home to know that just because it’s difficult doesn’t mean you are bad at it.”
“Even if I get it wrong, I want kids at home to know that just because it’s difficult doesn’t mean you are bad at it.”
December 5, 2024 at 3:03 AM
MP1 #iteachmath
“Even if I get it wrong, I want kids at home to know that just because it’s difficult doesn’t mean you are bad at it.”
“Even if I get it wrong, I want kids at home to know that just because it’s difficult doesn’t mean you are bad at it.”
Episode 1 of Amazon’s ‘Are you smarter than a celebrity’? Featured an engineer answering a 2nd grade math question. How would you answer this? #iteachmath.
December 5, 2024 at 1:33 AM
Episode 1 of Amazon’s ‘Are you smarter than a celebrity’? Featured an engineer answering a 2nd grade math question. How would you answer this? #iteachmath.
Today's quote.
December 4, 2024 at 7:29 PM
Today's quote.
You are welcome. Love MN (and NC)! Had a wonderful day with wonderful family.
Hope your time off is restful - a special shout out to every single classroom teacher.
Hope your time off is restful - a special shout out to every single classroom teacher.
November 29, 2024 at 3:12 AM
You are welcome. Love MN (and NC)! Had a wonderful day with wonderful family.
Hope your time off is restful - a special shout out to every single classroom teacher.
Hope your time off is restful - a special shout out to every single classroom teacher.