18 and 30 have no digits in common.
However, 1, 2, 3, and 6 are all factors of both 18 and 30.
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HCF is 3
30% of 18 = 5.4
The common factors of 12, 18 and 30 are: 1, 2, 3, 6
The Least Common Multiple (LCM) for 18 20 30 is 180.
The GCF is 3.