Your 10.5 - 5.6 = 4.9
The greatest common factor of 105 and 56 is 7.
Greatest Common Divisor (GCD) for 105 56 is 7.
The GCF is 7.
56 and 105
The greatest common factor of 56 and 105 is 7.
105
The second one.
The GCF is 7.
The greatest common factor of 161 and 105 is the same as the greatest common factor of 105 and 56. I obtained the number 56 by subtracting 161 - 151. Continue like this, until you get one number that is an exact multiple of the other. The next step is, 105 - 56 = 49, so you have to calculate the gcf of 56 and 49. This method is known as Euclid's Algorithm.
840
The GCF is 1.
Try 7.