2 digit addition
2+(-7)
-5
-3+(-4)+(-2)
-9
-3+4+(-6) + 4
-1
15+-21
-6
8+(-5)+3
6
16+(-2)+(-5)+(-8)
1
-4+(-8)
-12
-12+6+(-4)
-10
-4+3+(-5)+(-6)
-12
16+(-30)
-14
-40+37+(-25)
-28
-2+(-16)+(-4)+16
-6
-60+23
-37
-16+42+(-21)
5
-8+16+(-4)+2
6