This is a game for two players, a group of 3 or 4 players, or for the whole class. You will need to download and cut out or otherwise make 2 sets of these 24 cards.
Separate the 40 number cards from the 8 operation cards and shuffle them separately to mix them up.
With a small group of 2, 3 or 4 players each player is dealt 3 number cards and 2 operation cards and has to rearrange them to get the highest positive number. This can be played with a timer. The player who gets the highest number wins one point. If more than one player gets the same highest number each of them gets a point. The first player to reach 10 points is the winner.