Common core states that the students will be able to write numbers and show how much that number represents (0-20). Here are some stations that I have use. My math stations are used for 2 weeks.
Using links to represent the number 6
Using a pipe cleaner and beads to represent the number 4. (great for fine motor skills too)
Forming the number 6 on a geo board
Using domino cards to practice one to one correspondence
Using play dough to form numbers and showing how much it represents in a ten frame