His work was incorrect, the number has the most value is the greatest number
Because 7 > 5, then 7.25 and 7.52 will be 1st and 2nd numbers and 5.72 and 5.27 will be 3rd and 4th numbers.
Let's compare 7.25 and 7.52
Because 2 < 5 (the tenth digit) so 7.52 is 1st number and 7.25 is the 2nd number
Now, compare 5.72 and 5.27, again, 7 > 2 (the tenth digit) so 5.72 is 3rd number and 5.27 the 4th number.
Totally, the order from greatest to least is 7.52 , 7.25 , 5.72 , 5.27