This article briefly describes the timing of the first concentrated study of algebra over the 100 years of NCTM, from a 9th-grade course taken by only about 1/5 of students to a course taken by virtually all students, with almost half taking it in 8th grade.
Each month, two invited authors reflect on an important mathematics education topic from perspectives of either “Then” (the past) or “Now” (the present with an eye toward the future).