You have a point F on the number line. In order to determine which is this point, you consider the number of subdividions between whole numbers, on the number line.
Then, you can observe, that there are five subdivisions between whole numbers. By counting the number of subdivisions from number 2 until point F, you can notice that point F is at the subdivision four.
Tis situation can be written as a mixed number, by add to the lower nearest whoel number (in this case is 2) the fraction of point F. The fraction for F is 4/5 (4 subdivisions takes in 5 subdivisions). Then, you have:
point F at 2 4/5