What fraction is shown by the shaded part of the model?

To determine the fraction represented by the shaded part of a model, first identify the total number of equal parts in the model and the number of shaded parts. The fraction can be expressed as the number of shaded parts over the total number of parts. For example, if there are 4 total parts and 2 are shaded, the fraction would be 2/4, which simplifies to 1/2.