Excerpted from Sarama and Clements's chapter in NAEYC's book K Today: Teaching and Learning in the Kindergarten Year, the authors explain that in response to the need for high-quality early childhood mathematics instruction, the field has developed research-based content standards identifying key concepts and skills children need to gain comprehension and ability in mathematics. They outline the concepts and skills for kindergartners and make recommendations for how teachers can develop kindergartners' mathematics power.