I recently had students do a project where they apply the distance formula to finding the shortest path for a traveling salesperson to travel between 8 cities. The basic idea is, the students use the longitude and latitude coordinates as substitutes for the x and y coordinates of the city, then they can use the distance formula to find a pseudo-distance between the cities. Of course, on any kind of largish scale, this makes no sense, but on a small enough geographic scale the error in the distances is small, and I made sure the kids were aware of this deliberate error. This project was intended to be a chance for the students to get lots of practice using the distance formula.

You can view a sample of the students work **here **which I have permission from the student to share. This was rather an exceptional sample for many reasons. The first reason is that the student went to extraordinary measures to format his document and arrange his work in a clear logical sequence. Another reason I really enjoyed looking at this student's project was because he had obviously done research about the traveling salesperson problem, including appropriate mathematical terminology such as the 'Hamiltonian path'. He talks about the limitations of the approach we took, the errors he found in the project, and suggests an improved method than the brute force solution. He uses technological tools to his advantage, learning a bit of JavaScript to find the coordinates of the cities, and using Excel to greatly reduce his calculation time for the distances between the cities.

If all of our students work was so neatly arranged and so carefully done, I think very soon we'd soon have much different jobs. Instead of 'instructing our students' we would be learning from them as equal partners. This what I strive for in my teaching.

David is a Formative Assessment Specialist for Mathematics at **New Visions for Public Schools** in NYC. He has been teaching since 2002, and has worked in Brooklyn, London, Bangkok, and Vancouver before moving back to the United States. He has his **Masters degree in Educational Technology from UBC**, and is the **co-author of a mathematics textbook**. He has been published in **ISTE's Leading and Learning**, **Educational Technology Solutions**, **The Software Developers Journal**, **The Bangkok Post** and **Edutopia**. He blogs with the **Cooperative Catalyst**, and is the **Assessment group facilitator for Edutopia**. He has also helped organize the first **Edcamp in Canada**, and **TEDxKIDS@BC**.

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- Mathematics education blogs
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- Migrating away from Google Reader
- Free tools for math education
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## Comments

## That is truly an excellent

That is truly an excellent piece of work and a fantastic project. I've passed it on to my colleagues here at ISD, don't know if Sonja follows this blog so I'll pass it on to her as well. This is a great example of how to combine technology in a meaningful way into teaching.

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