9-4=
5
8-3=
5-2=
3
7-6=
1
10-4=
6
17-5=
12
12-5=
7
16-9=
14-8=
18-10
8
10+3=
13
10+7=
17
10+6=
16
10+9=
19
10+1=
11
67-19=
48
43-39=
4
55-38=
85-48=
37
28-19=
9
98-79=
64-27=
65-37=
28
41-25
94-56=
38