The Fun of Maths

We have already learned how to play three new maths games: Salute, Addition Snap and Star Jump Addition.  Have you got cards at home?  We'd love to teach you how to play.

Split a deck into two piles (of numbered cards).
Two people flip them at the same time then add the two
numbers. The first to call the answer (if all agree it's correct
gets both cards - the player with the most cards wins).

Split cards into two piles, two players walk around their set
while a third person calls STOP, they flip the card they are closest to, bring
it into the middle and the first to add it wins, the other swaps
with the caller.