10+15
25
3-2
1
4:2
2
3•2
6
13+14
27
2-3
-1
5:5
4•3
12
18+20
38
17-9
8
9:3
3
10•3
30
27+23
50
23-6
17
12:3
4
15•2
123+432
555
32-17
15
30:5
20•5
100