This study investigated the relationship between prospective secondary mathematics
teachers’ perspectives and their mathematical knowledge for teaching in action. Data
from two prospective teachers’ practice-teachings, one in geometry and one in algebra,
their lesson plans and self-reflections were analyzed with Teacher Perspectives and
Knowledge Quartet frameworks. Results showed that prospective teachers who thought
of mathematics and mathematics learning as dependent on the knower, corresponding
with a progressive incorporation perspective, had demonstrated all the codes in
Knowledge Quartet Framework. These results suggest that, once prospective teachers
are given opportunities to develop a progressive incorporation perspective on
mathematics, mathematics learning, and mathematics teaching during methods and
practice teaching courses, this might conrtibute to the developments in their
mathematical knowledge for teaching in action, independent of the particular concept
they teach. Suggestions for developing a progressive incorporation perspective during
methods and practice teaching courses are given.