Ummm......I need help......

We need to find 19% of 205.
To compute any percentage, you divide by 100 and then multiply by the percentage you want:
[tex]19\%\text{ of } 205=\dfrac{19}{100}\cdot 205=2.05\cdot 19=38.95[/tex]
So, there are 39 students in fifth grade (we obvisouly had to round, since there can't be a fractional number of students)