Ten Frame

From The Ultimate Guide to Using Ten Frames (teachingmama.org):

If you teach math to early childhood students, it’s important to understand what a ten frame is. Ten frames are tools for teaching math and they help kids with developing number sense. This post will help you understand the benefits to ten frames and provide printable resources that you can use in your classroom or home right away.

Ten frames help with developing number sense. Number sense is having good intuition about numbers and their relationships. This develops gradually as children explore numbers and have experiences with them. Number sense is something that can’t necessarily be taught, but it can be caught or learned over time.

To print the “pill” in multi-material/color, check this video: How To: PrusaSlicer Filament Swaps (Multi-Material on ANY* 3D Printer) - YouTube