adding by 1's
12+1
13
24+10
34
12+5
17
38-5
33
43-10
33
25+1
26
38+10
48
61+5
66
30-5
25
98-10
88
68+1+1
70
76+10
86
32+5
37
98-5
93
29-10
19
45+1+1+1
48
57+10
67
75+5
80
77-5
72
65-10
55
82+1+1+1+2
87
63+10+10
83
84+5
89
69-5
64
57-10
47