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18
18/81 = 2/9 (divide top and bottom by the hcf of 18 & 81 = 9)
18 = 2 x 3 x 3 99 = 3 x 3 x 11 So hcf = 3 x 3 = 9
HCF = 3... LCM = 18 !
6 is the HCF of 18 & 48