To find 1/3 of 246 students, you would divide 246 by the denominator of 1/3 which is 3. 246 divided by 3 is 82. Another way to formatting this is 246 x 1/3 which is also 82.
This means 1/3 of 246 is 82 so 82 students ride to school in a car. If 1/3 is 82, 2/3 (the remaining amount of student) is 164 (82 + 82 = 164 , 1/3 + 1/3)
So 164 students (2/3 of the students) ride the bus to school.