By applying Euclid’s Division lemma on 243 and 75
243 = 75 x 3 + 18.
Since remainder ≠ 0, apply division lemma on 75 and remainder 18
75 = 18 x 4 + 3.
Since remainder ≠ 0, apply division lemma on divisor 18 and remainder 3
18 = 3 x 6+ 0.
Therefore, H.C.F. of 75 and 243 is 3.
