Although we will expose our students to many numbers during the kindergarten year, we need to develop a sound foundation with the numbers 0-10. Instead of rushing on to the teen numbers when your students recognize the numbers to 10, continue working with those numbers. Students need to be able to recognize the numbers 0-10, write them, count out the correct number of objects again and again, compare numbers, match number and quantity, and (eventually) add and subtract numbers within 10. If you develop a solid foundation, then using numbers beyond 10 becomes much easier for students.
To help your students recognize and use numbers, check out the following materials: