Hi Quiet Cricket,
I found some powerpoint online from other doman mom's website.
http://worldsbesteducation.org/math.aspx . but i think you are too far ahead that this might not be helpful...give it a try. and yes, also, check the downloads section here. i wish more people would post their dot math presentations. i am dreading the point where i will have to make them.
i really like the idea of doing equations by mouth like someone else suggested.
good job with your son. getting up to equations is pretty good! i hope he enjoys the presentations.
ariel