The LCM of 5 and 10 is 10, but those are the same fraction so if you reduced 2/10 to 1/5, you could use 5.
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It is 10 so that 2/5 + 1/2 becomes 4/10 + 5/10 = 9/10
You need at least 2 numbers to get a lowest common denominator. The lowest denominator for 238 is 1, but as there is no other number in the question, there is no common denominator.
You need at least two fractions to find a common denominator.