To determine HCF -> make sure that you include all the numbers with the lowest index notation, whereas for LCM, you will need to include the highest index notation for the numbers, where in special cases, if a number has an extra number like 2^3 x 3^6 x 5 x 7^2 x 4, where in this case, it is a 4, we will include the 4 into our LCM, so the LCM for this case will be 2^4 x 3^6 x 5^2 x 7^8 x 4.