We're reviewing dividing by two, multiplying by two and the general concept of doubles.
Today, we took it a step further, about the idea of leftovers (or remainders).
I said to her, "If there are 9 cookies on the table and you need to split them between you & Ben, what would you do?"
She said "I'd get 4, Ben gets 4, and Mommy gets the extra one!"
Smart kid, and right too. ;o) The spare is always Mommy's.