At Marble Middle School, 35% of the students are 6th graders, 32% are 7th graders, and the rest are 8th graders. What percent are 8th graders?

you just have to add 35 plus 32 which you get 67 then subtract 100 from 67 and you get 33

All the students in that Middle School combined would equal 100%. So just add 35% and 32%, and subtract that answer from 100 to find out the percent of eighth graders.

35% + 32% = 67%

100% - 67% = 33%

The percent of 8th graders at Marble Middle School is 33%