Edward shades the blue section first with a given decimal. Then overlaps it in yellow with a second given decimal. The overlapping area is the shaded green section, which gives us the product.. What is the problem Edward was solving that matches this model? 1-5 x 0.4 = 2.0
2-0.4 x 0.5 = 0.20
3-0.5 x 0.5 = 0.25
4-0.4 x 0.4 = 0.20