Teaching at common ground

Yesterday we covered topics from prime factorization. Once you know prime factorization of a particular number its easy to find several things. You can count all the factors of that particular number. You can even find the sum of all those factors and also count of the numbers that are less than it and that relative prime to it. Ofcourse prime factorization allows you to quickly find HCF and LCM of two given numbers once you have found the prime factorization of each of those numbers