Sample choice boards for primary students:
Designing Digital Activity Lists is a website that we created for teachers when the pandemic started. This page has some primary examples.
Graphic organizers are a powerful way to guide thinking. Start on this ELA page, then look at Math. There is one or more primary example on those pages. As you look, keep in mind that many of the other graphic organizers can be translated into a more interactive format via technology. So you may get ideas for non-primary students here as well!
This is a how-to sheet for primary students. Consider any of the structures you'd use with older students. How can you structure it to be simpler? How can you use images to reinforce text? How can you use tools like QR codes, video directions, etc. to enable young students to access content?