As the word "common" might suggest, HCF is normally defined for two or more numbers, not just one. The highest "common" factor of a single number will be itself so the answer to the question is 315.
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Steps to find out LCM of two numbers(a & b):1- Find HCF of a & b.2- Multiply a and b.3- Divide the result of step 2 by HCF. The result is LCM.1- In order to find out HCF of 540 and 315 we shall use the method of prime factorization.Prime factorization of 540 = 2x2x3x3x3x5Prime factorization of 315 = 3x3x5x7HCF(540, 315) = 3x3x5 = 45.2- Product of 540 and 315.540 x 315 = 170100.3- LCM(540, 315) = 170100/45 = 3780.
21% of 315= 21% * 315= 0.21 * 315= 66.15
315% = 3.15 315 = 31,500%
The LCM is: 315
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