Mathematics Their Way Blackline Masters Author:Mary Baratta-Lorton, Lorton Baratta Celebrate 20 years of Mathematics Their Way -- the complete curriculum to replace, support, or supplement your existing program -- with the new 20th Anniversary Edition. Discovery and exploration using concrete materials to develop skills in addition, subtraction, pattern recognition, measurement, and more. The Twentieth Anniversary Set include... more »s the Teacher Sourcebook and blackline masters. Grades K-2« less