Introducing base systems can be a confusing topic. What does it really mean quantitatively when you have a larger or smaller base system?
We like to think of the Hexadecimal Triangle as the Rosetta Stone of binary, hexadecimal, and decimal. Students who worked with this material in the primary classroom can return to it with an expanded understanding of what the patterns of empty and full really mean. For students encountering this material for the first time, the reality of the quantity of marbles can be quickly and easily translated so that students can appreciate what it means to see a number in each base system.