I too would suggest car rides. Does he like to spell? You can ask a few spelling questions, then a few math questions, then a few spelling questions ... Let him to ask you questions as well.

elh0706 DS5 likes the same kind of problems. Dinner time seems to be his favorite time. 3x + 10 = 5x, 1/9*x = 17 and such seem to be his favorite ones.


LMom