I am going to guess that the Mathnasium experience varies greatly from location to location. We tried the one closest to us requesting "enrichment," and did not think the learning justified the high cost. They seemed to be simply assigning grade-level worksheets and not allowing our DC to move quickly though the material. DC enjoyed it, but DC is social (and liked the lollipops they provided)! I don't think it HURT DC, but I can't really say it helped much, either.
With the help of Dreambox for DS and EPGY for DD, we've since adopted a "Momnasium" (yes, I've called it that and my DC think I'm a bit silly
) program at home of afterschooling that has been much more effective. Both DC have made nice progress lately and both are excelling in math.
