I love this I had the idea that a paperbag journal would be best for this. That way you could make a cool journal with pockets wou could store the cards you make with the problems
Ooooh, I like that idea a lot. I was also thinking you could write your problem on the left hand page, and paste a pocket or envelope on to the right hand page to hold the card made for that problem, and your notes on its meaning and how it helped out beneath.