To find the percentage of first-grade students at the assembly, we can use the formula:
\[ \text{Percentage} = \left( \frac{\text{Number of first-graders}}{\text{Total number of students}} \right) \times 100 \]
In this case, the number of first-graders is 6, and the total number of students is 25. Plugging these values into the formula gives us:
\[ \text{Percentage} = \left( \frac{6}{25} \right) \times 100 \]
Calculating the fraction:
\[ \frac{6}{25} = 0.24 \]
Now, multiply by 100 to convert it to a percentage:
\[ 0.24 \times 100 = 24 \]
Thus, the percentage of students at the assembly who were first-graders is:
\[ \boxed{24%} \]
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