Two 10 by 10 grids are shown. The first grid has 4 columns and 6 squares shaded green. On the same grid, 6 squares and 4 columns are shaded red. On the same grid, 8 squares are shaded blue. On the second 10 by 10 grid, 3 columns and 8 squares are shaded blue.

Part A
Write the multiplication expression shown by the model. Do not solve the problem.




Part B
Explain the expression written in Part A. Include the final product and how it is shown with the model.