Description: It's nice to practice conversion problems, but how about applying our new knowledge of percentages to a real life problem like recycling? Hint: don't forget your long division! Created by Sal Khan. What percent of cans are recycled? Since we're going to get a value less than 1, let's put a decimal right over here. And we could say, hey, look, 20 goes into 13 zero times.*Teacher Advisor is 100% free.