The HCF of both numbers is 6
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There is an infinite number of common multiples for 18 and 42. A common multiple of any two numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).
1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, 126.
8 does not divide 42 evenly so 42/8 is not a whole number.
The number is 18 because 42+18 = 60