I have only use Math U See. I'm using the Prime with my 3 yr old, and he's made it halfway through th book only doing it once or twice a week. We didn't necessarily use the blocks every time either, and I'll be honest, I didn't wait til he was "mastered" but understood enoug to be able to figure it out on his own again later. It did help him with counting from 10-100 though, those tricky teens don't mess him up as often.
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