How To Do Grids and expressions

I am going to teach everybody how to do grids and expressions. First step is to make or draw a grid. How do you do that? Well it depends. Maybe it could be a 6x8 grid or maybe a 5x9 it doesn't really madder. Color in two parts of the grid. Next is the expression. First you have to break apart the to parts into multipication problem like 4x5= (4x3)+(4x2) and this is how you check this 4(5)=20. This is how you do grids and expressions.