3 * 37 = 111
6 * 37 = 222
9 * 37 = 333
12 * 37 = 444
15 * 37 = 555
18 * 37 = 666
21 * 37 = 777
24 * 37 = 888
27 * 37 = 999
111.111.111 * 111.111.111 = 12.345.678.987.654.321
1 * 9 + 2 = 11
12 * 9 + 3 = 111
123 * 9 + 4 = 1111
1234 * 9 + 5 = 11111
12345 * 9 + 6 = 111111
123456 * 9 + 7 = 1111111
1234567 * 9 + 8 = 11111111
12345678 * 9 + 9 = 111111111
1 * 8 + 1 = 9
12 * 8 + 2 = 98
123 * 8 + 3 = 987
1234 * 8 + 4 = 9876
12345 * 8 + 5 = 98765
123456 * 8 + 6 = 987654
1234567 * 8 + 7 = 9876543
12345678 * 8 + 8 = 98765432
123456789 * 8 + 9 = 987654321