7+8= 15
3×6=17
7-3=3
9×2=18
4-4=1
78+3=80
3×10=3
6×6=35
7×9=63
43-4=39
5+3=8
34+4=48
54-5=49
7×8=55
8×8=63
7+1=7
43-10=33
68-7=61
0+1=0
89+2=90