The GCF is 1.
2
14 over 16 is a fraction, not two separate numbers. Therefore, a single number, and especially a fraction, cannot have any common factors.
The GCF is 16.
GCF(56, 28, 14) = 14.
The GCF is 1.
The GCF is 2.
The GCF is 2.
The GCF is: 2
The GCF is 2.
The GCF is 1.
The GCF is 2.
The GCF is 2.
There is no highest common multiple of 14 and 16. Whatever common multiple you come up with as the highest I can always add the lowest common multiple of 14 and 16 (122) to it and get a higher common multiple of 14 and 16.
2
The GCF of 10, 16, and 14 is 2.
14 over 16 is a fraction, not two separate numbers. Therefore, a single number, and especially a fraction, cannot have any common factors.