18 = 2 * 3 * 3
70 = 2 * 5 * 7
Thus:
LCM = 2*3*3*5*7 = 630
HCF = 2
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The HCF is: 2The LCM is: 2,520
LCM is Least Common Multiple of 2 or more numbers. So, LCM of 1 number i.e. 18 is not defined. Similarly, HCF is Highest Common Factor of 2 or more numbers. So, HCF of 1 number i.e. 3 is not defined.
hcf = 42, lcm = 84.
HCF is 48 and LCM is 576
6 and 36 12 and 18