Last week Kal-El discovered the commutative property. This work began with building all of the ways to make ten and writing them in his math notebook. He discovered that 9+1 and 1+9 both equal ten, as do 8+2 and 2+8, etc., He went through his math notebook and crossed out the duplicate equations.
The next step was to use blank slips of card stock to cover the duplicate equations on control chart one. Afterward, he was presented with control chart two. He was really excited about the new control chart. At least once a day he refers to control chart one and says "I don't need that one anymore."
He enjoyed this work tremendously. He was so excited by it that he asked to borrow the camera to take some pictures afterward. The next three photos are some that he took himself of his own work. You can see his toes in the first shot :)
Addition strip board, control chart one, control chart 2, math notebook, and container of paper slips.
Close up of his math notebook with the duplicate equations crossed out.
The addition strip board.
I noticed over the weekend that he took the addition strip board off the shelf and re-built the equations for ten several times.
As always, if you are looking for something that will show the "big picture" of the memorization of addition sequence all in one place this post at Ecole et Cabrioles is excellent. Also, if you need free memorization of addition materials you can find them at Livable Learning/JMJ Publishing.
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