Markers or ink pens
White construction paper
Yellow construction paper
Orange construction paper
The first thing you will need to do is to create a triangle with rounded corners on card stock. You can either use mine or save ink and make your own. You will need to create two lines in between your triangle so it looks like this:
As you can see, I've done number recognition, letter matching, addition, and subtraction.. I'm sure there are other ways to use these cards it's just a matter of imagination.