True: HCF stands for HCF, The HCF of 2 Prime Numbers is 1, The HCF of 16 and 24 is 8, The HCF of 6 and 8 is 2, The HCF of 54 and 81 is 27, False: You need to know the multiples to work out the HCF, You can only work out the HCF of 2 numbers , The HCF of all odd numbers is 1, HCF of 48 and 360 is 2, HCF of 100 and 200 is 50 ,

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