Last Thursday was costume day at Judy's school. 50% of the 168 students wore a costume. How many students wore a costume?
To find the number of students who wore a costume, you need to find 50% of the total number of students.
50% of 168 students is (50/100) * 168 = <<(50/100)*168=84>>84 students.
Therefore, 84 students wore a costume.