The roles of punctuation marks (ESM)

A new online first article has been published by Educational Studies in Mathematics. The article is written by B.M. Brizuela and G.A. Cayton, and it has been called: "The roles of punctuation marks while learning about written numbers". The researchers investigated how children in kindergarten and first grade articulate the meaning of and need for punctuation marks in price lists. Based on their findings, they claim:

These findings provide evidence that children are, in fact, creating
and recreating ideas about different aspects of written numbers such as
the role of punctuation marks before necessarily being able to fully
articulate how written numbers work and before being formally taught,
though they have obviously been exposed from an early age to these
particular aspects of written numbers.