The Beauty of Mathematics Numbers on Fun For Brain Part IV

Fun For Brain
Apparently there is math behind the difficulty of art or beauty in mathematics, see the figures below :
 

1 x 18 + 1 = 19
12 x 18 + 2 = 218
123 x 18 + 3 = 2217
1234 x 18 + 4 = 22 216
12345 x 18 + 5 = 222 215
123456 x 18 + 6 = 2222214
1234567 x 18 + 7 = 22,222,213
12345678 x 18 + 8 = 222 222 212
123456789 x 18 + 9 = 2222222211

123456789 + 987654321 = 1111111110
1 x 142 857 = 142 857 (same number)
2 x 142,857 = 285,714 (same numbers different sequence)
3 x 142 857 = 428 571 (each different sequence numbers)
4 x 142 857 = 571 428 (each different sequence numbers)
5 x 142,857 = 714,285 (same numbers different sequence)
6 x 142 857 = 857 142 (each different sequence numbers)
7 x 142 857 = 999 999 (waw. ..... a fantastic result)

123 +45-67 +8-9 = 100
123 +4-5 +67-89 = 100
123-6x7 +4 x5 +8-9 = 100
123-45-67 +89 = 100
123-4-5-6-7 +8-9 = 100
12 +34 +5 x6 +7 +8 +9 = 100
12 +34-5 x7 +6 +8 +9 = 100
12 +34-5-6 x8 +7 +9 = 100
12 +34-5-6-7 +8 x9 = 100
12 +3 +4 +5-6-7 +89 = 100

By. Fun For Brain