K.CC.B.4a - Understand the relationship between numbers and quantities: connect counting to cardinality. When counting objects, say the number names in the standard order, pairing each object with one and only one number name and each number name with one and only one object.

K.CC.A.3 - Write numbers from 0 to 20. Represent a number of objects with a
written numeral 0-20 (with 0 representing a count of no objects).

K.CC.B.5 - Count to answer “how many?” questions about as many as 20 things
arranged in a line, a rectangular array, or a circle, or as many as 10
things in a scattered configuration; given a number from 1–20, count
out that many objects.