Bases. (decimal, binary etc) are best explained through examples. "You can only writer three symbols in base 3. These are: 0, 1, 2" So you count: 0, 1, 2, 10, 11, 12 ... I think the word "symbols" is confusing, but so is "characters"? Students don't think of numbers or letters as "symbols" or characters. The card sorting puzzle helps with this. But I'm always refining the language: How would you put this as plainly as possible?

Desmos makes noise now???

Mathstodon

Fractal Kitty (@fractalkitty@mathstodon.xyz)

I had fun making sounds in desmos to go with this: https://www.desmos.com/calculator/qezi3o36sc?ref=fractalkitty.com #desmos

#desmos is out of control. Here is my guide to all of the features I've found so far. You can make logic gates in there. You can do lists and iterate things:

Desmos

Desmos Hacks n Tricks

Explore math with our beautiful, free online graphing calculator. Graph functions, plot points, visualize algebraic equations, add sliders, animate...

They've added summation and it's a little strange sometimes how it works. This threw me. You set i to be a list and it give you three answers. It won't evaluate it if you don't set an upper bound. I'm excited but also a little horrified that this is the new SAT calculator. It's just so feature-rich.