5+7
12
12-7
5
2x3
6
1x1
1
5x2
10
12+5
17
90-12
78
17+12
29
6x3
18
7x7
49
2x6
20-13
7
2,000-3
1,997
4x4
16
5x12
60
46-6
40
9x3
27
3,000-1
2,999
9x6
54
12x12
144