Using number cards, turn all the cards to face down. Players take it in turns to choose two cards to turn over. If the pair make the target, the player keeps the cards and has another turn. If the pair does not total make the target, they turn them back over, and it is the end of their turn.
For example: your teacher may tell you to add the two numbers together to make a target of 10, or they may ask you to multiply the two numbers together and get a target of over 30.