Justin does this as well. Last night, for example, DH had 8 little mints. Justin said "how many do you have? Do you have four so we can each have one?" and DH said "no, I have 8." Justin said "oh good, we can each have two!"
Math is a different concept than English... knowing A WAY to do it is the goal. It does not really matter what the way is...Justin certainly did not drag out manipulitives or write out a division problem, but solved it "in his head."
I think he's on the right track!
