The entire set of 161 Montessori Math, Geometry, Language, Botany, Zoology, History, and Geography (Upper Elementary, ages 6-12) material descriptions and first presentations. Montessori materials are easy to use when you know their purpose and how to use them. Very often, the materials you purchase do NOT come with instructions. This is perfect for homeschoolers and Montessori teachers alike.Choose presentations for your LOWER and UPPER elementary weekly plans from the ordered pre-populated lis