That's the least common multiple, or LCM.
The common multiples of 18 and 27 are 54, 108, 162, 216, and so on. Each is a multiple of 54, which is the least common multiple of 18 and 27. There is an infinite number of common multiples for 18 and 27. 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).
They are numbers that each of the two numbers can divide without remainder.
There is an infinite number of common multiples for 6 and 8. A common multiple of any two numbers is any number into which each of two or more numbers can be divided evenly (zero remainder).
There is an infinite number of common multiples for 5 and 7. 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 of 5 and 7 is 35.
There is an infinite number of common multiples for 8 and 12. 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 of 8 and 12 is 24.
There is an infinite number of common multiples for 18 and 30 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 of 18 and 30 is 90.
There is an infinite number of common multiples for 36 and 48. 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 of 36 and 48 is 144.
There is an infinite number of common multiples for 13 and 81. 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 of 13 and 81 is 1,053.
There is an infinite number of common multiples for 20 and 32. 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 of 20 and 32 is 160.
There is an infinite number of common multiples for 118 and 90. 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 of 118 and 90 is 5,310.
There is an infinite number of common multiples for 2 and 10. 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 of 2 and 10 is 20.