You call it "War," we call it "Greater than Wins." Just use the classic card game of "War" to reinforce the developing sense of greater than/ less than. We play it with rook cards (no King/Queen/Jack cards to confuse little kids) and we chant "greater than wins" as we all flip over our card at the same time. Use math terms as you play and now it's a math game! Questions like, "Who wins this one?" "Are you sure that's greater?" or "How do you know?' go a long way, as usual.