Answer:
The value of the expression modeled by the decimal grids is 4.13
Step-by-step explanation:
Question is incomplete (the decimal grids are missing; see attachment for complete question).
Few points to be noted when reading a decimal grid are.
1. The scale of the grid
2. The ratio of the shaded region to the whole region
3. A fully shaded grid represent 1.
The scale of the grids in this question is a 10 x 10 grid.
10 * 10 = 100
Meaning that there are 100 squares in a grid
Having said this, well proceed to getting the decimal value of each individual grids.
For grids before the addition sign (+)
The first grid is fully shaded; so, it'll be represented with 1
The second grid is also fully shaded; thus, it'll also be represented with 1
The third grid has some of its region shaded; 23 of the 100 squares are shaded.
So, the third grid = 23/100 = 0.23
The Summation of the grids before the addition is 1 + 1 + 0.23 = 2.23
We move to the grids after the addition sign.
The first grid is fully shaded; so, it'll be represented with 1.
The second grid has some of its region shaded; 90 of the 100 squares are shaded.
So, the second grid = 90/100 = 0.90
The Summation of the grids after the addition sign is 1 + 0.90 = 1.90
Now, we can properly represent the grids in decimal forms.
This will be represented as
2.23 + 1.90
And that's equal to
4.13
Hence, the value of the expression modeled by the decimal grids is 4.13
