From the given image, notice that 8 out of 9 rectangles are colored green. Four are colored with a dark green and the other four are colored with a light green.
Since those 8 rectangles are separated on two groups of 4 rectangles, then 4 is 1/2 of 8. Consequently, 4/9 is 1/2 of 8/9.
Therefore, 1/2 of 8/9 is:
[tex]\frac{4}{9}[/tex]
