1 because they are both prime numbers
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the lcf is 105
The least common factor, for any two integers, will always be 1. Finding the LCF is, therefore, a pointless exercise.
The LCF of 4 & 7 is... 1 ! There are no other common factors.
5. 35/5=7, 40/5=8
The least common factor of any set of integers is 1.