18 cannot be a multiple of 90 since it is smaller than it. 90 however is a multiple of 18. 18x5 = 90. an easy way to check is to divide the bigger number by the smaller number.
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The Least Common Multiple (LCM) for 3 18 30 is 90.
The Least Common Multiple (LCM) for 18 15 is 90.
Since 90 is a multiple of 18, 18 is the GCF of 18 and 90
90
Any multiple of 90.