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Anonymous
It is not possible to give a sensible answer to this question. The highest common factor (HCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question!
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The HCF is 15.
HCF of 225 and 105 is 15.
The HCF of 30 and 105 is 15.
105
The GCF/HCF of 100 and 225 is 25.
3.
The GCF is 3.