This is a math activity that I created to use with my kindergarten kiddos that helps reach many of the common core standards:
Base 10 - composing and decomposing number
Counting and Cardinality - writing numbers 1 - 20, recognizing numbers 1-20, counting to answer "how many"
I have used this activity as a guided lesson in small groups at first, then I also used it as a math center for students to do independently or with a partner. Both ways have been very successful.
I have given 3 Kindergarten common core standards that are used in this lesson, but this can also be used for 1st grade math standards as well.