HCF is 3
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18 and 30 have no digits in common.However, 1, 2, 3, and 6 are all factors of both 18 and 30.
least common denominator for 15 and 10 is 30, so 9/15 = 18/30 and 7/10 = 21/30
The factors of 18 = 1, 2, 3, 6, 9, 18 The factors of 30 = 1, 2, 3, 5, 6, 10, 15, 30 Therefore, the common factors (CF) of 18 and 30 are 1, 2, 3, 6 The Greatest Common Factor (GCF) = 6
The multiples of 6 are numbers that can be divided evenly by 6, such as 6, 12, 18, 24, and so on. The multiples of 15 are numbers that can be divided evenly by 15, such as 15, 30, 45, 60, and so forth. The least common multiple of 6 and 15 is the smallest number that is a multiple of both 6 and 15, which is 30.
The highest common factor is 15