Squares/Cubes
Using squares of 5:
105^2
11025
9 x 9
81
28
11 x 11
121
Using squares near 100 rule:
107^2
11449
9 x 86
774
Add all the numbers form 1 to 12
78
1111 x 1111
1234321
11^3
1331
9 x 31
279
Add all the numbers between 5 and 15
110
111^2
12321
14^3
2744
999 x 34
33966
595
111111x111111
12345654321
225^2
50625
999999 x 18
17999982
Add all the numbers between 85 and 99
1380
11111111x11111111
123456787654321