Four through six year old students in the Montessori Primary Casa for children two-and-a-half through six years of age are introduced to formal mathematics following mastery of Practical Life, Sensorial, and Language prerequisites. My First Montessori Book of Addition, a condensed version of Montessori Primary Addition, focuses on identification and naming of the essential combinations of addition from 1 + 1 = 2 through 9 + 9 = 18. Learning is supported by clear color-coded bead illustrations as a foundation for future addition work. Written and illustrated by AMI Diploma holder Mary Da Prato, My First Montessori Book of Addition is a great resource for fostering basic addition facts in preparation for future mathematic succes