I found it troubling that there was an extra marshmallow along the length of some of the edges. I understand why it's there, just that it's confusing for beginning learners.
For the 3D shapes that have marshmallows connecting toothpicks to form the slanted edges, the marshmallows are necessary to ensure that the slanted edges are longer than the base edge. For a regular hexagonal pyramid, for example, the faces are isosceles triangles and therefore the slanted edges are longer than the base edges.
My son used it to play his geomags 😊
I used these activity cards with my 3rd grade students and they loved them. They had fun building the 2D and 3D shapes with marshmallows and toothpicks. It was also an educational experience as we worked together to determine the number of sides and vertices for each shape. Thank-you!
Nice clear diagrams