Represent Numbers: Represent Numbers 11-20 . Identifying the quantity of a collection beyond ten objects requires counting. It is not possible to subitise (identify a quantity without counting) the quantity of collections larger than 6 or 7. . Counting is not a single concept. There are many principles involved. Students need to understand the oral counting order does not change. They need to know to only tag each object being counted once and to assign one number name (in order) to each object.