👉 Shelf math is a method of organizing and calculating the number of items on a shelf or in a storage area efficiently, particularly useful when the exact quantities are not known but must be estimated. It involves grouping items into categories based on their size, weight, or other relevant characteristics, then determining the number of items that can fit on a shelf given these groupings. For example, you might have categories like "books (small)," "books (medium)," and "toys," and estimate how many of each type can fit based on their dimensions and the available space. This approach helps in making quick, approximate decisions about storage capacity and item placement without needing precise measurements or inventory lists.