2+2
20+20
40
2-2
0
24-12
12
2 x 2
4
3+4
7
40+20
60
5-2
3
60-30
30
4 x 4
16
6+5
11
60+40
100
6-3
63-20
43
5 x 5
25
7+7
14
80+70
150
7-3
89-67
22
7 x 7
49
9+9
18
99+99
198
8-6
2
99-83
7 x 8
56
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