42 + 79 = 121
(40+70) + (2+9)
= =
110 + 11
=
121
29 + 79 + 42 = 150
1,042
79 + 79 = 158
Sum = 79*(79+1)/2 = 79*80/2 = 3160
a + 79
79 + 79 = 158
79 is prime.
79 + 79 = 158 / 2 = 79.
79
The solution to 79 plus 39 is 118. The solution to 79 minus 39 is 40.
200 plus 79 equals 279
The GCF is 1.