5x5=
25
100-50
50
243+658
901
5x9
45
999999999-999999999
0
20+28
48
9x9=
81
two-one
1
600+977
1577
12x12
144
985-96
889
777+456
1233
12x11
132
178-179(can go into negative)
-1
999+994
1993