One of the better ways of addressing this is to convert both fractions to incorporate the LCD. The LCD here is 5(6) = 30, so
24/5 = 144/30 and 23/6 = 115/30. Obviously 144/30 is greater than 115/30,
so 24/5 is greater than 23/6.
Alternatively, find the decimal equivalents to 24/5 and 23/6 and then compare the results.