Determining the Volume of a Solid Manual with Lesson Plans Prove the concept of volume sensorially and formulaically. Save yourself HOURS of work. This is Unit 5: The Volume of Solids Please be aware that the majority of this manual section is written and illustrated by hand.This resource is relevant to ANY child, regardless of whether they have been in a Montessori environment or not. It is suitable for parents and/or teachers and perfect for homeschooling. 13 concept lessons/presentations fe