It's 90. 18x5=90. 10x9=90.
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18 is the lowest one.
The least common multiple is the smallest number that is multiple of two or more numbers. 6: 12, 18, 24, 9: 9, 18 The LCM of 6 and 9 is 18.
The multiples of 3 are: 3, 6, 9, 12, 15, 18, 21, etc ...The multiples of 6 are: 6, 12, 18, 24, etc ...The multiples of 18 are: 18, 36, 54, etc ...The lowest multiple common to 3, 6, and 18 is 18, so the LCM = 18.
LCM or least common multiple of 24 and 18 is 72 so any multiple of 72 is a common multiple To list them all we can write {m| m=72n for some natural number n) which means the set of all m such that m is a natural number multiple of 72 Or you can just say all common multiples of 24 and 18 are 72k where k = 1,2,3....
The least common multiple of 3 and 9 is 9. because: Multiples of three are: 3, 6, 9, 12, 15... Multiples of nine are: 9, 18, 27, 36.... The Least Common Multiple (LCM) there in both of the numbers is 9.