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Since 15 is a factor of 90, it is automatically the GCF. Since 90 is a multiple of 15, it is automatically the LCM.
The greatest common factor of 99 and 90 is 9.
15 is a factor of 90 so their LCM is 90.
90 and any factor of 90 for example, 10 and 90
The greatest common factor of 54 and 90 is 18.