Complex Numbers – Support for Calculations

I received a question on one of my Youtube video posts on the Casio Fx991 scientific calculator asking if it was possible to do complex number calculations on this calculator. The answer is of course yes – which then prompted me to make a quick video today on exactly how to do that with the fx991. See the video below:

This of course then made me think of our other technologies and that perhaps I should show how to do complex numbers with these tools as well.

Here’s the steps on the graphing calculators (any of the Casio models, since they all basically work similarly – the beauty of Casio, the buttons are relatively consistent). This example uses the CG50, but see fx-9750, fx-9860, etc).

And finally, on ClassPad.net, the FREE online math software that does it all – statistics, geometry, graphing, and of course calculations. (You can sign up for a free account (ALWAYS free) – here’s a quick how-to).

The question of course arises, when are we even using complex numbers? Or why do we need them? As I never really taught math content that required students to utilize complex numbers, I don’t feel I am able to answer these questions with authority, so I did a bit of research. For one, if we just go from a ‘content/standards’ perspective, if you are in states that incorporate The Common Core Math Standards (or a version of, whether renamed or not), then it is actually part of the High School: Number and Quantity standards which state, “Students will…”:

  • Perform arithmetic operations with complex numbers
  • Represent complex numbers and their operations on the complex plane
  • Use complex numbers in polynomial identities and equations

But, that of course doesn’t really get at why do we need them. So here are some things I found in my search for this answer. I admit I can’t explain these any more than just listing them, but it at least points to places where complex numbers are in fact important and needed.

  • Complex numbers are used in electronics to describe the circuit elements (voltage across the current) with a single complex number z=V+iI
  • Electromagnetic fields are best described by a single complex number
  • People who use complex numbers in their daily work are electrical engineers, electronic circuit designers, and anyone who needs to solve differential equations.

Hopefully this is helpful to those of you who are in fact doing complex calculations for whatever reason!

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ClassPad.net – My Math Love-Affair Continues….

I am a lucky woman.

For my almost 30 years in education, I have loved what I do. Teaching math, helping others teach math, finding amazing tools and resources that make learning math engaging and exciting – my ‘work’ is a labor of love. My love-affair with mathematics and teaching has been influenced by many experiences and people and has led me to yet a another new adventure in my quest to help others love and appreciate the beauty of mathematics – Classpad.net,  a free, web-based software that I have been directly involved in, from conception, to development, and now, to public release and hopefully, viral usage!

Some of my Key family

It’s been a weird path of growth, with connections leading to new opportunities, and more connections, and more opportunities. As a new teacher, and also working on my masters at VCU in VA, I worked under John Van De Walle, who started me on the path of making mathematics hands-on and visual and based on problem-solving. This quest led me to look for resources and share my love of math at conferences – sparking my professional development/training itch.

DG5 Groupies!

My search for visualization and hands-on resources led me to a closet in our math department, where I found Discovering Geometry and Sketchpad. And as I used these resources to present at conferences, I got to know and LOVE Key Curriculum and become, I admit, a groupie. This led to getting to know the Key sales folks and being asked to become a Key consultant. All this PD experience led to an administrator job, where, miracle of miracle, all the Discovery books from Key were just being adopted, so I was part of this implementation, which led to meeting Key’s PD trainer, Tim Pope. As a result – lo and behold, this groupie is working for Key!

It was a dream come true! The Key family, one full of former math educators all trying to share the love of mathematics and create inquiry-based, engaging math through great problem-solving and dynamic math technology tools, was amazing. Then – the dream burst, the family split up, and the books went to Kendall Hunt (with Tim), and the technology to MHE (with me).

Heartbreak.

Casio Family

Time to open a new door: I decided to finish my doctorate and branch into the unknown world of education consulting. And that Key family? They are still there – sending connections and opportunities, which is why I now teach at Drexel, work with Casio, travel the world for The Dana Center and Department of Defense Education Activities, among many other experiences.

At this moment in time, my worlds have collided. My Casio family, which is a group of math educators trying to share the love of math and teaching and learning math through dynamic visualization, is inspirational. We’ve worked as a collaborative team, with Casio‘s incredible R&D team in Japan, to create a tool that is going to revolutionize mathematics. It’s everything math teachers want on one page, and it’s just in it’s baby-phase right now with potential for growth that is exciting.

The guys behind booth magic!

Classpad.net has a partnership with Kendall Hunt just recently announced. Those very Discovering Mathematics books I so love will be adding to their power of inquiry by providing our tool as the discovery math tool embedded in the ebooks. My new family is joining with my old family….(and Tim and I are reunited) (and we have a podcast too – 180days Podcast)(shameless plug)!

Right now? It feels like I’ve connected many parts of my life – where many of my previous ‘experiences’ and worlds have joined together. Not sure if this is the circle of life, or a Mobius strip, or maybe an example of a network with many nodes. But whatever it is, it feels right, it feels exciting and it feels limitless.

So, what is Classpad.net?

It is something that makes me proud to be a part of because it is a web-based software, freely available to teachers and students, that encompasses all the things I wished for as a teacher, and it’s all in one place instead of several different tools that don’t communicate with each other. My doctorate dissertation was on edtech, and how teachers have so many technology tools forced upon them (hardware, software, apps, tablets, PC’s, interactive whiteboards, student response systems, etc) and none of them talk to each other, and each require separate training and support. Instead of using any of these tools effectively, teachers use the ones they are comfortable with, and often not the tool that makes the most sense for helping students learn. Or worse, no tools at all.

Classpad.net solves that problem by being a tool where you never have to leave the page – you can do geometry on the same page you are doing statistics. You can add a calculation, you can make a graph – all from one place. You can dynamically show mathematics and students can explore math and make their own discoveries on a table or a laptop or a phone – with the touch of a finger. There is a complete CAS (computer algebra system) engine behind this software, so it’s capabilities and functionality are incredibly robust. We are just in the ‘beta’ stage of release, which is even more exciting because we are really seeking input and feedback from users – what’s not working for you? what do you want? And, just like a start-up tech company, our team is responding quickly and changing based on what teachers and students want and need. The possibilities are endless because we have Casio’s 60 years of worldwide technology expertise and the experiences and input of math teachers building something that can be what teachers and students really need, want, and use – all in one place.

We have a Classpad.net Youtube Channel that we are just starting to build out, but here’s a quick overview of Classpad.net

It’s only the beginning – so check it out. But, as someone who has had a long-standing love affair with math and math technology, this is going to be a fun ride with so much more to come!! Join the fun and start creating with math and sharing your love of math as well on Twitter and Facebook!