Square root of 25 over 4?

It is not clear how far the scope of the square root extends:

(√25)/4 = (√(5²))/4 = 5/4 = 1¼ = 1.25

√(25/4) - √(5²/4²) = (√(5²)) / (√(4²)) = 5/2 = 2½ = 2.5

I suspect you meant the latter, as in the "square root of all of 25 over 4".