The T-Shirt Factory: Place Value, Addition, and Subtraction is one of eight units in the Contexts for Learning Mathematics Investigating Number Sense, Addition, and Subtraction (K3) This unit begins with the story of Grandma Eudoras T-Shirt Factory. Grandma Eudora is part of the Masloppy familya large, endearing family that finds it difficult to keep track of things. Everyone is forever losing, misplacing, and looking for...