40% of the students in the sixth grade at a student's school participate in sports, how many sixth graders are there at the student's school?

Well what I like to do is take 52 and multiply it by 1. whatever the percentage is. I say 1. whatever the percentage is because in your case 40 %. 1 equals the whole amount the percentage after it counteracts the percentage so 52*1.4=72.8

Answer = 72.8 or 73 people