NC = North Carolina, right? Different state.

Math is so much more than counting and adding. I'm not a fan of the approach of "the kid already does kindergarten/1st grade stuff so we should move onto 2nd grade stuff."

Toys and games are perfect. Checkers, Sorry, dominos, tangrams, jigsaw puzzles, plus cooking together, and good 'ol Legos, blocks, modular train tracks, and similar toys.

The advantage of these is that they teach thinking skills that elementary schools don't have time to teach.