This net is for a rectangular prism, we can find the surface area by adding all of the areas together.
the area of the small square is 2 x 2 = 4, there are 2 so 4 + 4 = 8
the area of one of the long rectangles is base x height. 20 x 2 = 40
there are 4 of these rectangles so 40 x 4 = 160
Adding it all together we get 160 + 8 = 168 ft^2
It is a visual thing. You can see how big or small the fraction is. So the one that is shaded the most in the fraction strip will be the largest fraction, and the one that is shaded the least is the smallest fraction.
Wouldent the answer be A because all percents are out of 100 so the 1.9 would be 9 over 100