Ans: The lowest common multiple (LCM) is found by multiplying all the factors which appear in either list of factors of the numbers. Example: The LCM of \\(60\\) and \\(72\\) is \\(2 \ imes 2 \ imes 2 \ imes 3 \ imes 3 \ imes 5\\), which is \\(360\\). The highest common factor (HCF) is found by multiplying all the factors which appear in both lists of factors of the numbers. Example: The HCF of \\(60\\) and \\(72\\) is \\(2×2×3\\), which is \\(12\\).