Same as LCM...
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an improper fraction!
The denominator is ten times the value of the numerator.
There is no "most common multiple". To find all common multiples, you start by finding the least common multiple. All other common multiples are multiples of this least common multiple.
u find the common denominator
To find a common denominator, it's what 4 and 7 go into, and that's 28.