9 + 3 = 12
4 + 4 = 8
7 + 8 = 15
1 + 12 = 13
13 + 15 = 28

4 x 4 = 16
1 + 16 = 17
17 - 9 = 8
8 + 3 = 11
7 x 11 = 77

9 - 7 = 2
4 x 2 = 8
8 + 1 = 9
4 - 3 = 1
9 - 1 = 8

3 x 4 = 12
7 x 12 = 84
84 + 1 = 85
9 x 85 = 765
4 x 765 = 3060

3 x 9 = 27
27 - 4 = 23
7 + 23 = 30
1 + 30 = 31
4 + 31 = 35

4 + 1 = 5
5 - 3 = 2
9 + 4 = 13
7 + 13 = 20
2 + 20 = 22

3 x 4 = 12
1 + 12 = 13
9 + 13 = 22
22 x 4 = 88
7 + 88 = 95

4 + 7 = 11
3 x 11 = 33
4 x 33 = 132
132 - 1 = 131
9 + 131 = 140