1
2
3
4
5
40-7
28+7
35-3
13-6
26+5
19+2
40+30
80-20
85-42
33
35
21
60
70
7
32
31
43
?
2 + 2 + 2 + 2 + 2 + 2 =
12
6 = 12
.