Counting Method / June 6, 2018 / Ximena Lucas
Unitizing: Our number system groups objects into 10 once 9 is reached. We use a base 10 system whereby a 1 will represent ten, one hundred, one thousand etc. Of the counting principles, this one tends to cause the greatest amount of difficulty for children.
Cardinality: When a child is counting a collection, the last item in the collection is the amount of the collection. For instance, if a child counts 1,2,3,4,5,6, 7 marbles, knowing that the last number represents the number of marbles in the collection is cardinality. When a child is prompted to recount the marbles how many marbles there are, the child doesn't yet have cardinality. To support this concept, children need to be encouraged to count sets of objects and then probed for how many are in the set. The child needs to remember the last number represents the quantity of the set. Cardinality and quantity are related in counting concepts.