Desmos is an on-line graphing calculator that allows students to dynamically interact with equations

October 1, 2013

Quick overview: Desmos is a powerful graphing calculator that works in a web browser or on Apple iOS devices. Desmos can graph color coded functions, plot tables of data, transformations, and more. Free!

What does the tool do? To start, here’s a simple example of an intercept slope from the Desmos website. For other possible uses, I’ll provide you with a description from the Desmos website, “The calculator can instantly plot any equation, from lines and parabolas up through derivatives and Fourier series. Data tables open up a world of curve-fitting and modeling. Sliders make it a breeze to demonstrate function transformations. As browser-based HTML5 technology, the graphing calculator works on any computer or tablet without requiring any downloads. It’s intuitive, beautiful math. And best of all: it’s completely free!”

How can I use it in the classroom? Use the tool as another way to explain trickier concepts to students. For a more student centered approach, you could allow your students to experiment with the tool on your Interactive White Board (SMARTBoard) during the hands-on portion of class. Students can also use the Demos app on an iPad/iPhone to pick apart and play with equations at their own desk. (Source: Adam Bellow’s “Make Your Classroom Rock” ISTE 2013, San Antonio)

Web Link: www.desmos.com
iPad/iPod App Link: Link to App storedesmosict_50


Mobile Monday: Two apps that can help students in an individualized math classroom

March 18, 2013

This ICT tip could be best applied to the following subjects:

App info: Khan Academy for the iPhone, iPod, and iPad / Cost: Free (No official Android version, but many 3rd party equivalents exist)

App info: Wolfram Alpha for the iPhone, iPod and iPad / Cost: 4.99$ (Android version available too)

Kkhanhan Academy: If you haven’t heard about Khan Academy, please read my earlier blog post. Khan Academy now has an iPad app that students can use to view hundreds of math related videos recorded by Salman Khan. The benefit of the iPad app (compared to simply watching his videos on YouTube) is that the majority of the videos are broken down into small “one sentence chapters” which allows students to skip back and forth to any part in the explanations. This app could work well in an individualized classroom when you may not have enough time to re-explain a concept to one particular student, he may benefit from another explanation, and/or learns better at his own pace. While they are lots of sites that have math tutorial videos, these videos are all recorded by the same person (i.e. – consistent) and Salman Khan’s explanations are considered by many teachers and students to be top notch. Definitely worth checking out.. Free!

wolfWolfram Alpha: While I covered Wolfram Alpha in an earlier blog post, this amazing iPad app can bring a whole new dimension to problem solving in a math classroom. In a nutshell, Wolfram Alpha is a very advanced calculator, which you can see in these examples. Not only does the app allow you play with a plethora of real world statistics but it also allows you to solve algebraic math problems too. If you notice that a student made a mistake on a traditional paper worksheet, you can ask him to plug the math problem into the app and then use the “step-by-step” problem solver. With the assistance of the tool, the student may be able to figure out on his own (or with your help) at what step he made the mistake on paper. You can then sit down and work on the problem area together. (Thanks to Cathy Hortop for exploring these two apps with me at New Horizons, ETSB)

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