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There cannot be a lowest common factor of just one number. To be common there need to be at least two numbers.
The lowest common factor can not be larger than the lowest common factor. If you mean LCM (Lowest Common Multiple) and not LCF, the numbers are 5 and 150.
The LCF of any pair of numbers is always 1, since it is the lowest number that can be a factor and is a trivial factor of all numbers. The least common factor of any set of numbers is 1.
Well, honey, the lowest common factor of 70 and 105 is 35. It's like finding the smallest number that both 70 and 105 can be divided by without leaving a remainder. So, there you have it, 35 is the winner in this number game.
The knowledge of prime numbers is useful when finding the lowest common multiple or the highest common factor of two or more numbers.