Draw the tape diagram: a long rectangle and divide it into 4 squares in a row.
The whole rectangle represents 24 (as a whole number), you're dividing it into 4 parts because you want to know what is 1/4 of it.
Now, to find the value of each square: 24:4 = 6.
Put the number 6 in each square, and you have found your result.
1/4 of 24 is 6.