It is hard for students to visualize large numbers. This unit is full of large and small group area and volume activities to help students work, build, draw, and problem solve. Students are asked to explore and build composite and prime numbers using base 10 blocks. Student start with base 10 blocks and then move to grid paper and pencil. The "Millions" activity is an inquiry group activity. The "Millions" activity could be done as a small group or whole class lesson. Included are recommended videos and books. The "Millions" activity helps teachers construct one large cube made of 1,000,000 cm cubes.