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Since one number ends in a zero, your least common multiple must also end in one. 21 x 10=210 and 30 x 7=210It is: 210
Least common multiples do not use zero as a multiple, as the LCM for any number and zero is zero.
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. Furthermore, the word "LEAST" is a superlative adjective and that means there can be only one.
Any multiple of 30 is also a multiple of 15.
There is an infinite number of common multiples for 30 and 60. A common multiple of any two or more numbers is any number into which each of two or more numbers can be divided evenly (zero remainder). However, the least or lowest common multiple (LCM) of 30 and 60 is 60.