We can divide the big rectangle into a 5x4 grid. I recommend you to do that physically with a pen or pencil. There are 20 grids in total. Now count the shaded grids. You should get 13.
13/20
multiply both the numerator and denominator by 5 to get it to 100.
[tex] \frac{13*5}{20*5} [/tex]
[tex] \frac{65}{100} [/tex]
This is also equal to 65% and .65
