Some shapes are not full rectangles. This 3rd grade area of shaded parts worksheet shows six rectangles on a grid, and each one has a few white squares. Your child finds the area of the shaded part only, and a worked example at the top of the page shows the method step by step. First, find the area of the whole rectangle. Then take away the white squares. The rectangles are small, from 16 to 28 square units, so the subtraction stays easy, even for a child who still counts on fingers. Page two is the answer key, and it shows every step. As a result, you can check the working, not only the final number.