6+8
14
10-9
1
20+30
50
7-4
3
8-5
3
5+12
17
100-90
10
15+5
20
5-2
3
200+300
500
50-9
41
9-7
2
98-88
10
6-3
3
4+30
34
10-1
9
2+2+2
6
24+5
29
2+23
25
20-2
18
12+7
19
11+2
13
900-800
100
7+7
14