No one can tell with certainty since nobody has used the elementary books yet, they just came out.
If money is not an issue I would start with the very first book in the series. It is supposed to be about fun anyway, not about hard work. If your DDs are confident readers they will just fly through it and be ready for the more challenging ones in no time.
My DS6 is going through Fractionsright now and it is a liitle hard for him - long hand division and such. After he finishes it I am going to let him go down a level and go through book 4 of the elementary series ([i]Dogs?)[/i. Just for fun.
By the way, in every book Stan keeps constantly going on tangents and talks about astronomy, economics, roman numerals ...you name it. So, starting with easier books still lets them learn something.
Last edited by green valley; 06/30/11 09:23 AM.
