factoring
142=2*71
999=3*3*3*37
no common factor so common multiple is 142*999=141,858 other mutliple woudl jsut be twice or three times or four thimes etc 141,858
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999 ÷ 7 = 142 remainder 5
142, 284, 426, 568, 710, 852, 994, . . .
The greatest common multiple of any set of integers is infinite.
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.
Each common multiple of 9 and 10 occurs exactly once (in the list of common multiples), so there is no common multiple that occurs the most. All common multiples of 9 and 10 are the multiples of their least common multiple which is 90.