I do not know of 'least common decimal', but i do know of 'least common denominator'
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There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of a pair of fractions.
The least common multiple of 64 and 96 is 192.
The least common denominator of 3 and 13 is 39.
Their least common multiple is 42.
The Least Common Multiple (LCM) of (15,33,44) is 660.