Our focus in elementary classrooms since the project began in 1998 has been
on students' learning and reasoning. We have worked with students in Kindergarten
through eighth grade in the greater Boston area.
The current materials on this website are designed for Kindergarten through eighth
grade. The Kindergarten, first, second, third, and fourth grade lessons are designed to be presented twice a week. K-2 lessons are approximately 30 minutes long, and Grade 3-4 lessons are approximately 45 minutes long. The fifth grade
lessons are designed to be presented weekly, for approximately 90 minutes.
However, you should use the materials however they fit best into your classroom
routine. If you have not introduced algebra into your mathematics lessons in
the past, you may find the lower grade lessons adequate for much
The middle school lessons have been implemented as part of a summer camp
experience. Each activity specifies the approximate amount of time that it will
require to implement. Some of these lessons may be adequate for students beyond
Please consider these materials "ideas for classroom discussions" rather than
off-the-shelf, ready to go materials. They are in Word format so that you can
edit them to fit your classroom needs.
Classes are extremely interactive; opening with a simple problem or
demonstration and initial discussion, followed by group work and then a
comparison of the diverse strategies used in solving the problems. A large part
of the time is dedicated to having students' explain their thinking and their
work is licensed under a Creative
Commons Attribution-NonCommercial-ShareAlike 4.0 International License.