Mana, if your DD is like mine,
a) she would not finish the SM K series and if you insist that she does, she will whine about how you are torturing her by giving her easy stuff
b) would resist any instruction from you on the proper use of the Montessori math manipulative but will spend considerable amount (by which I mean 2 weeks) using them in her own way.
c) At the end of that 2 week period, she will no longer go back to the manipulative but would have learnt a lot such that she can easily do mental math. And in fact, it will be easier for her to work with the abstract representations than the manipulatives.
d) she will continue to use the walls and furniture for her graffiti work into the foreseeable future no matter how much you threaten her to stop. smile