What is the sum of the numbers 56 and 64 of their gcf and another sum written down

40.   We are looking for the sum of the 2 numbers: 56 + 64
But we need to find first their GCF:

Find for the GCF of 56 and 64
Factors of 56 => 1, 2, 4, 7, 8, 13, 28, 56
Factors of 64 => 1, 2, 4, 8, 16, 32, 64
In the given factors, let’s find the common factors of both numbers:
=> 1, 2, 4, 8,
Thus, the Greatest common factor of both numbers is 8.
=> 56 / 8 = 7
=> 64 / 8 = 8

Now, let’s find the sum:
=> 56 + 64 = 120
Other sum:
=> 8 (7 + 8)
=> 8 (15)
=> 120

The answer is 1 because you have to flip the sign when dividing by negative number and 3