Math Operations Posters These Math Operations Posters include: addition, subtraction, multiplication, and division. They can be displayed near the Math Shelf in your classroom for a simple, helpful reminders to your students. I suggest posting them in Lower Elementary (1st-3rd grade) classrooms, but they are also useful for advanced younger students, as a reminder for older students, and in a homeschool environment. These posters are color-coded to match the Montessori math curriculum. Each