"It is essential that we match our methodology with the psychology of the adolescent and as this changes throughout adolescence, so should our approach." Mike Waski provides an understanding of how to approach mathematics at the adolescent level from the perspective of the developmental characteristics of the age. Sharing observations from his own work with adolescents, Waski shares his deep understanding of the adolescent personality and specifically how the personality relates to their work in mathematics. Beginning with concrete work in elementary and building through abstract work, the older adolescent eventually begins to consider the philosophical nature of mathematics. In mathematics, the adolescent finds a study of precision that is founded in the search for undeniable, fundamental truths. [This talk was presented at the NAMTA Adolescent Workshop at the AMI/ USA Refresher Course, February 17-20, 2017 in Austin, TX.]