10 + 10 = - 13 20 50
5 + 11 = - 16 12 18
3 + 4 = - 16 12 18
3 + 4 = - 5 45 7
12 + 6 = - 2 18 22
7 + 7 = - 14 24 8
5 – 2 = - 1 3 4
10 – 8 = - 18 2 12
15 – 6 = - 4 9 10