Montessori uses math manipulatives even in the elementary years. It makes learning math so much easier! Manipulatives for the Upper Elementary (Gr. 4-6) has some great free printouts and directions for base 10 (like golden bead material)- geometric solids using pyramids, prisims, paper, pencil, masking tape, scissors-geoboard-color tiles-tangrams-pattern blocks-blocks & cubes. You can use some of the ideas for younger Montessori students.