These activities are things you can do with very young children to help them learn about numeracy- and also have a lot of fun. Most of the activities are short and can be done while waiting for something to cook or chill.
Try to encourage young children and not compete with them even though some of the activities will induce competitive feelings. Instead of commenting on the children's skill, for example- comment upon how much fun they are having and/or how difficult the task and how everyone is managing it differently but well.