This math topic covers the skill of division through skip counting. Specifically, students practice calculating how many sets of an item there are when given a total count and the number per set, by skip counting by 9. Each problem provides a scenario such as counting trays with muffins or windows with panes, and asks how many units (trays or windows) contain a specific number of items, using a skip counting method to find the quotient from the division of two integers. The structure is consistent across several problems, each involving different quantities but using the same skip counting basis and division concept.