bradstreet, I would second that about skipping Primer. I did use it with my first two kids (we have been using math u see for about 6 years now),but
child #3 disliked it so much that I am looking for a different way to teach K math.
One book I came across is Math Games by Peggy Kaye – looked like it had a lot of really fun ways to teach basic math.
HTH