This cannot be determined because the common multiples of any two or more numbers are infinite.
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28 multiples are 7,4,1,2,14,28, 63 multiples are 1.63.3.3.7 greatest is 7
The Greatest Common Divisor/Denominator is 21
The least common multiple of 63, 105, and 2142 is 10,710.You can determine this by looking at the multiples of each number individually and seeing when they match:63: 63, 126, 189...10,710105: 105, 210, 315...10,7102,142: 2142, 4284, 6426, 8568, 10,710
This cannot be answered because the common multiples of any two or more numbers are infinite.
The first 5 multiples of 21 are: 21, 42, 63, 84, and 105.