There are infinitely many such pairs of numbers. As long as the only primes they have in common are 2×3²×5 (the prime factorization of 90) their gcf will be 90:
Some examples:
90, 180
90, 270
90, 360
180, 270
180, 450
450, 630
630, 990
It is not possible to give a sensible answer to this question. 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 common multiple of the numbers 6 and 18 is 18.
The LCM of two numbers is one of the numbers when one of the numbers is a multiple of the other. The LCM of two numbers is the product of the numbers when they are relatively prime. In all other cases (like consecutive even numbers that aren't 2 and 4) the LCM is as you describe.
The least common multiple of the numbers 105 and 90 is 630.
Two or more numbers are needed to find their LCM
45 and 90
Since 30 is a factor of 90, the LCM is the larger of the two numbers, ie 90.
6 and 90
90 and 8
The LCM of these numbers is 90.
40 and 50
There aren't two prime numbers whose LCM is 90.There aren't two prime numbers whose total is 23.Other than that...The two numbers you are looking for are 5 and 18, but only one of them is prime.
In order to have an LCM, there has to be two or more numbers. Some multiples of 30 are 60, 90, 120, etc.
45 and 10
The LCM is 90.The LCM is 90.
The LCM is 90.
45 and 10