7 + 4 =
11
20 - 1 =
19
11 + 3 =
14
10 - 2 =
8
1 + 19 =
20
10 + 10 =
20
20 - 10 =
10
15 - 5 =
10
8 - 4 =
4
10 + 3 =
13
3 + 7 =
10
6 + 6 =
12
25 + 5 =
30
5 + 5 =
10
14 - 4 =
10
17 - 2 =
15
20 + 10 =
30
5 + 7 =
12
30 - 10 =
20
9 - 6 =
3