63 - 37 = 26
100 - 63 = 37
63 minus 21 is 42.
It is: 63-4 = 59
100-37 = 63
63
Since 37 is a prime number and the only factors are 1 and 37, and since 37 will not divide evenly into 63, the GCF of 37 and 63 is 1.
Negative 37 minus 28 is -65.
63 - 18 = 45
63 - 10 = 53
-16 - 63 = -79
45 - 63 = -18
111 - 63 = 48