A whole-class activity. There are 29 cards, with numbers from 1 to 30, if you have less students some can double up on cards. You start with the card that has the star in the corner, and the last card says "end". The student starting reads the first card and the rest of the class need to do the calculation and if their card has that answer they read out their card and then ask the next question. i.e. I have 6, who has 5 more? I have 11 who has 8 less? etc. This set makes use of addition, subtraction, doubling and halving.