Hi there!
To find the proportion of the number of six graders there at the pep rally, you need to make a fraction of the number of 6th graders over the total number of students at the rally.
Number of 6th grade students / Number of total students at rally
[tex] \frac{266}{500} [/tex]
Then simplify by dividing the top and bottom by 2.
[tex] \frac{266/2}{500/2} [/tex]
Which would give you:
[tex] \frac{133}{250} [/tex]
Hope this helps :)