Something perhaps a bit involved: 3D printing custom "counting" aids. I remember having the block sets that represented 1s (single, small blocks), 10s (a stack

Something perhaps a bit involved: 3D printing custom "counting" aids. I remember having the block sets that represented 1s (single, small blocks), 10s (a stack of them), 100s (a 10x10 plane), and 1000s (a solid 10x10x10 block) in class. Could make them something other than plain blocks, perhaps little figurines (apples? puppies?). Or take suggestions from the kids. Maybe something more relevant for the older kids. Then bring the 3D printer in and explain how it works. Making that connection between learning, tool-making, agency, and of course the specific technology itself.