7+8
15
10+3
13
5+17
22
30+20
50
4 x 4
16
50+30
80
100-40
60
5 x 5
25
20-10
10
25-4
21
2 x 7
14
3 x 6
18
80-2
78
100-8
92
50+8
58
70-9
61