From the TERC website:
In reality, no one can teach mathematics. Effective teachers are those who can stimulate students to learn mathematics.
Want to know why SCASD doesn’t use a math textbook for grades K-5?
Most traditional mathematics instruction and curricula are based on the transmission, or absorption, view of teaching and learning. In this view, students passively “absorb” mathematical structures invented by others and recorded in texts or known by authoritative adults. Teaching consists of transmitting sets of established facts, skills, and concepts to students.
Constructivism offers a sharp contrast to this view.
