We have also been looking at Volume and floating and sinking linked to a big book we have been reading. Here's a group of children having some great discussions about why things float and sink based on weight and shape rather than size.
Here's a group creating 3D shapes out of nets.
A Group made playdough and then used the cookie cutters to create shapes and compare sizes, lengths, widths and shapes.
Another group of children were making Milos by measuring and looking at different volumes. Yum yum.