How do you change 8 5 30 into a improper fraction?

If you mean ' 8 5/30'. as a mixed number.

Then to convert to an improper (top heavy) fraction.

{[8 x 30] + 5} / 30 Note the use of brackets

{ 240 + 5 ] / 30

245/30

Cancel down by '5'

49/6 = 8 5/30

NB 'Improper' is the correct mathematical expression. ' Top heavy' is just a casual term.