The G.C.D. of 1.08, 0.36 and 0.9 is
0.18
1.08, 0.36, 0.9 = 108100,36100,910
G.C.D of 108100,36100,910
G.C.D for fraction, we take L.C.M of denominator and G.C.D of numerator.
L.C.M of 100, 100, 10 = 100.
G.C.D of 108100,36100,90100 is 18100= 0.18