Multiples are just numbers that can be multiplied together to find the given number. So:
Multiples of 9: 1,3,9
Multiples of 18: 1,2,3,6,9,18
Common Multiples of 9 & 18: 1,3,9
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As 18 = 9 x 2 then 18 is a multiple of 9 so the Least Common Multiple is 18!
The common multiple of 4, 9, and 18 is 36.
9 is the smallest multiple of 9. The smallest multiple of any integer is itself.
The lowest multiple of 6 and 9 is 18, since it is the smallest number that is divisible by both 6 and 9.
90 is the least common multiple of 5, 9, 18, and 3.