The goal is to fill up the grid to get it as full as possible while using the space as efficiently as possible. Draw arrays on the grid to see how close you can get to 100. How many squares do you have empty?
Players use duplo blocks to form various shapes in pairs, while one is blindfolded. The one blindfolded will feel the shape using finger to count remaining circles in order to duplicate the shape.
Players in groups of threes use playing cards to practice addition and subtraction. The captain gives each player a card and they put it on their forehead (salute). The captain tells them the total of the two cards. The players have to guess the number on their card.