I help Walter with his math and understanding addition in a visual and physical way.

I take a regular sheet of paper with two big circles and a plus sign between them.
I take a number of pennies and place them in the first circle.
One by one we take a penny from one circle and move it to the other circle.
We then write down each addition problem and switch the facts.

For example:

If we are working on the number 8, I place 8 pennies in the first circle and 0 in the second circle.
So we wrote down 8 + 0,    0 + 8
Then I moved 1 penny in the second circle
and we wrote down 7 + 1, 1 + 7
and then moved another penny in the second circle
so we wrote down 6 + 2,   2 + 6  
and so on and so forth