I have been working on Blake with his math a lot lately. This week he's gone through regrouping with 3-digit addition problems with about a five second explanation. So I decided to see if I could trick him with regrouping subtraction problems. As he did the first one he realized that something was wrong because you couldn't have a negative number in the one's place. So it took another five second math lesson to explain the concept of borrowing from the tens place and he was off doing a pile of worksheets. As he left he commented, "Mom, you're never going to trick me. You can't even trick me with any times problems." My reply was, "Oh, yeah we'll see!" I then proceeded to give him a couple of multiplication problems - all of which he gave me the right answer to! When I asked who taught him that and how the heck he could do them in his head, his reply was, "Nobody did, it's easy...the first number tells you how many groups there are and the second number tells you how many are in each group." Holy cow! Needless to say, we've moved on to working with multiplication tables.
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