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I'll leave this as an ethical problem for parents and grandparents to decide. I recently had to unlimber my long dormant math knowledge to help my grandson work out a formula. It hurt somewhat, but at least I remembered how. Then ironically I saw in an item in @heather's Evernote Daily News about 'photomath' - an iOS and Android app that will work out (and graph!) math problems for you, whilst explaining and teaching the process. Scan the problem with a camera and text recognition, plus built in math smarts, will work through the solution in teaching mode and give you an answer. If I'd had this back in the day, I would probably be stepping rapidly through the screens and just getting the answers for my workbook - but sadly I learned my math in a day when we were taught tables by rote, had actual printed books of logarithms and I thought a slide rule was "new tech". So stuff has been pounded in. I'd counsel caution in releasing information about this app to anyone under the age of 18 though - let 'em suffer! ? But for parents & GP's wrestling with problem-wracked pre-teens, and somewhat antiquated math knowledge, this might be a godsend... ? https://photomath.net/en/