This printable worksheet makes use of building blocks, squares and dominoes to teach students how to count. It is aligned to the common core math standard
K.CC.4 "Understand the relationship between numbers and quantities; connect counting to cardinality" AND
K.CC.4b "Understand that the last number name said tells the number of objects counted. The number of objects is the same regardless of their arrangement or the order in which they were counted."
It mainly teaches students that the number of objects will remain the same even if those objects are rearranged in some other form.