Mathematicians work with tens as they explore place value, ten frames, and hundreds charts. Our entire number system is built from a system of tens. Developing a solid and flexible understanding of 10 as a benchmark number and how is works within our number system is essential to grow as math thinkers, and to describe a numbers relationship to 5 and to 10. Also, Mathematicians engage in weekly counting collections. This creates an opportunity to develop counting concepts of one-to-one correspondence, cardinality, sequencing, fluency, subitizing, skip counting, bench marks of 5 and 10 and more!