First, students will learn how to count as many as 20 things arranged in a line or rectangular array.
Counting objects 1 by Khan Academy
Count objects 1 by Khan Academy
Next, students will learn how to count as many as 10 things in a scattered or circular configuration.
Counting objects 2 by Khan Academy
Count objects 2 by Khan Academy
Subitize 1-6 using dice. Many games involve dice. Subitize 1-10, then 1-20, using ten frames. Scattered configurations can be used for small numbers, say, 1-5. Jack Hartmann songs can be used to help subitize. Songs for subitizing within 5 can be found here and here. Here's a song for subitizing within 10.
Why doesn't the Common Core ever mention subitizing?
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.