To find the percentage represented by the shaded portion of the 10 × 10 grid, you first need to determine the number of shaded squares relative to the total number of squares.
In this case, there are 100 squares in total (10 × 10 = 100) and 40 squares shaded.
To find the percentage of shaded squares, you use the formula:
\[ \text{Percentage} = \left( \frac{\text{Number of shaded squares}}{\text{Total number of squares}} \right) \times 100 \]
Substituting in the values:
\[ \text{Percentage} = \left( \frac{40}{100} \right) \times 100 = 40% \]
Thus, the percentage represented by the shaded portion is 40%.
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