> The only pitfall we've run into was in connecting the manipulation of the rods with the manipulation of the more abstract numbers.
You could try clearly printing the numbers on the rods - connecting the abstract symbol to the physical unit of measure. No science behind this, just the gut feeling of a father of 3.
You could try clearly printing the numbers on the rods - connecting the abstract symbol to the physical unit of measure. No science behind this, just the gut feeling of a father of 3.