Since one number ends in a zero, your least common multiple must also end in one. 21 x 10=210 and 30 x 7=210
It is: 210
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420
The least common multiple (LCM) refers to a multiple that is COMMON to two or more numbers. You have only one number in the question! The least multiple of a number is itself.
The least common multiple of the numbers 140 and 30 is 420.
The least common multiple is 210.
The least common multiple of the numbers 30, 70 and 45 is 630.