To find the percent of shaded squares in the bar diagram, we can use the grid model with 100 squares because it simplifies the process of calculating percentages. Here's why:
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Percent Calculation: Percentages are out of 100, so using a model with 100 squares makes it straightforward to determine the percentage directly based on the number of shaded squares.
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Example with 100 Squares: If Aiden uses a grid model with 100 squares and 16 of them are shaded, he can easily see that the percentage of shaded squares is \( (16 , \text{shaded} / 100 , \text{total}) \times 100 = 16% \).
Using a grid model with 100 squares allows for a direct application of the percent formula, making this model the most convenient for Aiden's needs.
If he were to use a model with 20 squares, he would need to multiply the result by 5 to find the percentage, which is a bit more complex.
Thus, Aiden should choose "A grid model with 100 squares. 16 squares are shaded." to find the percent of shaded squares efficiently.