Given:
total number of members = 55
7th grader members = 22
find the percentage of the 7th graders to the total members of the chess club.
We simply divide the part by the whole.
22 is the part and 55 is the whole. So, 22/55 = 0.40 x 100% = 40%
The 7th graders comprises 40% of the chess clubs members.