Although it seems a little advanced for Grade 4 math, I was interested in the flips, slides and turns aspect of things. This app seemed to be a quicker, more easily accessible alternative to Geometer's Sketchpad software, which I know I should be using, but which I just haven't gotten around to exploring yet (and don't know how to download for free, lol!)
So, I gave Coordinate Geometry a go, and downloaded it onto the boys' devices.
I was a little concerned that the big picture of the program would get lost on such a small screen (iPad mini), but it seem to work out quite nicely. My only complaint so far is that the figures on the plane can't be rotated; rotations, translations and transformations need to be done manually it seems, though the app does have a symmetry feature.
As usual with Fred's apps, this one comes with a built in instructor's guide, great for teachers, or for parents who are home schooling their children. It also features some exploratory activities, as well as more structured lessons and quizzes for students to complete.
We're just getting started with this app, but it seems it will be a good companion for our geometry unit in Math this month.