To find the decimal values you have to count the number of shaded squares and divide it by the total number of squares in the grid.
Left value:
The grid is 10 x 10, which means that it is divided into 100 squares.
There are 23 shaded squares in the grid, so you can determine the decimal value as follows:
[tex]\frac{nº\text{shaded squares}}{total\text{ number of squares}}=\frac{23}{100}=0.23[/tex]
Right value:
The grid is 10 x 10, so it is divided into 100 squares.
The number of shaded squares is 62. Divide 62 by 100 to determine the decimal value:
[tex]\frac{nº\text{shaded squares}}{total\text{ number of sqaures}}=\frac{62}{100}=0.62[/tex]
Now what is left to do is to add both decimal values:
[tex]0.23+0.62=0.85[/tex]
