The LCM of 9 and 16 is simply 9*16 = 144
First you need to find the GCF.
9 factors to [3 3] 16 factors to [2 2 2 2]
no common factors other than 1.
To find the GCF, take the product and divide by the GCF. In this case, since the greatest common factor is one, simply multiply them.
9 * 16 = 144
The LCM is: 144
Their product.