200 = 23 x 52
175 = 52 x 7
hcf = 52 = 25
lcm = 23 x 52 x 7 = 1400
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HCF = 3... LCM = 18 !
The HCF is always a factor of the LCM of two numbers. The HCF is a factor of both the numbers which are factors of their LCM. Thus the HCF is also a factor of the LCM of the two numbers.
The LCM is: 175
5 and 10 lcm- 10 and hcf= 5
hcf stands for highest common factor, referring to factors that two numbers have in common, so it does not make much sense to ask for the hcf of a single number.However, you could ask,"what is the hcf of 175 and 175 ", which , of course, is 175.