Subtraction
23-8=
15
42-19=
23
97-79=
18
40-21=
19
20+15
35
31-17=
14
55-27=
28
18-9=
9
62-26=
36
52+25=
77
71-23=
48
85-47=
38
21-19=
2
93-27=
66
82+12=
94
60-48=
12
36-24=
12
56-37=
19
76-28=
48
33+58=
91
81-45=
36
27-19=
8
46-18=
28
67-29=
38
60+40=
100