We found an instructable on making chalk art patterns in CorelDraw. But guess what? — you can use this technique to poster print all kinds of fun 3d designs. The instructable is here. Its pretty cool! We sent a logo perspective box, aReuleux car and some conic section models to the NWMath Conference. PDFs can be printed in various sizes. “Chalk”

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## MathHappens @ Austin Museum Day!

Here’s a link to an interview I did this morning with CBS Austin’s Trevor Scott. MathHappens Foundation is an active participant in the Austin museum community. We have learned a lot in eight years of collaborations about the way museums approach storytelling, sharing knowledge and ideas with an intent to spark interest and start conversations.

## Take and Make: Magician’s Rods

I learned about these on a video on Numberphile. . In the video they said the magic words “no longer available” and that was it, we had to make our own. Josephine Sheng designed these way back in 2017 I think, and we just never posted. We don’t like “tricking” people, but if you have a good half hour you can

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## Take and Make: Conic Sections Model

Turns out you can use CorelDraw to reverse engineer the parts to a conic section model. Read all about it in the November 2021 MAA Math Horizons page called Do The Math (p. 29). Editor Tom Edgar was fun to work with, and made the graphic images. Note: if you are “making” this model from scratch, once you find the

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## Finally Making a working Peaucellier Linkage

Why does this project NEVER turn out? It happens that we have been missing a critical fact. The arm of the linkage is NOT the same length as the radius (k) of the larger reference circle used for the inversion even though we wanted it to be. The workshop is littered with failed tries. The arm length and the sides

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## Take and Make: Napier’s Bones Calculator

Napier’s Bones are a manually operated calculator created by John Napier in 1612. This calculator is based on Lattice Multiplication and helps math learners with multiplying large numbers by a single digit number. Math learners! Start identifying multiplication patterns by making your own set of Napier’s Bones! Materials: Napier’s Bones Paper Template: https://tinyurl.com/rh5xdajt Writing utensil (pencil or pen) Popsicle sticks

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## New audience. Old artifacts.

If you are a fan of museums, then you have seen something like this object before… probably dozens of times. This impressive artifact is a nocturnal from La Belle and it can be used to tell time at night by the positions of the stars. As historic artifacts and symbols of exploration and discovery, navigation tools like this one spark

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## Webinar: Making the Most of Math Connections at your Museum or Historical Site

Elizabeth Lay, Claire Steffen and I had the opportunity to present a webinar through the Texas Historical Commission today. We discussed ways that museums can enhance visitor experiences with math, showed a variety of examples of math activities at museum locations and talked about our process in developing connected activities. Our Presentation Slides are here The Handout Recording Hosted by

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## Take and Make: Proof without Words Sum of Odd Numbers – Freese Transformation

This Geometric Transformation shows how the sum of the first 6 consecutive odd numbers is the square of 6, or 36. It’s the classic “proof without words”. Freese’s Transformation also shows this relationship, but his “squares” have sides sqrt 1, sqrt 3, sqrt 5, and so on. Freese Corel File, Adobe Illustrator File, Jpg printable

## Take and Make: Experimental Mathematics Cucumber Edition

Here’s a fun one! Inspired by a conversation with Chris Daniels of Public Math. He said roll paper around a cylinder and cut on an angle to get an ellipse and produce a sine wave. So we did! And you can too. Then you can make a roller from ellipses, reflect your sine curve and roll the elliptical roller along

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