This project doesn't work online.So download it and set 'Turbo speed' This calculator can calculate LCM and HCF of two numbers.Two lists show the prime factors of the numbers. Instructions: Click the buttons to enter the 1st number.Then click one of the buttons HCF and LCM as your wish.Then enter another number and press 'Space' to get the answer. If it takes much time, please wait.You can download it and set 'Turbo speed' to make it work fast.