1Define the HCF and the LCM, and explain how you can tell which a question is asking for.
2Explain the prime factor method for finding the HCF and LCM of 60 and 72.
3Why does HCF multiplied by LCM equal the product of the two numbers?
4A floor is 240 cm by 180 cm. Find the largest square tile that fits exactly, and say how many tiles are needed.
5Two buses leave every 24 and 36 minutes, together at 6 am. When do they next leave together, and why is this an LCM question?