Ahhh, yes, working on a computer is the wave of the future. Make sure you don't complain that your child isn't learning, because learning on the computer is how it's going to be.
Watch digits carefully, particularly if you have an intuitive kid who will need to be taught the habit of showing ones work. I would also recommend you purchase an algebra textbook at the local used book store so your kid can use the index to look up "commutative property" for a 30 second refresher instead of turning on the computer, logging into digits (cross your fingers it's not down), find the part on commutative property (which will only be there if the class has already been there in class, but also only if the teacher doesn't "clean up" the site and remove it), then watch a 7.5 minutes of sickening & insulting video for the same information.
My local Half Price Books sells algebra books from the local university and community college for $5.99 each. A bargain.
