Piramide de números

1 x 8 + 1 = 9
12 x 8 + 2 = 98
123 x 8 + 3 = 987
1.234 x 8 + 4 = 9.876
12.345 x 8 + 5 = 98.765
123.456 x 8 + 6 = 987.654
1.234.567 x 8 + 7 = 9.876.543
12.345.678 x 8 + 8 = 98.765.432
123.456.789 x 8 + 9 = 987.654.321

1 x 9 + 2 = 11
12 x 9 + 3 = 111
123 x 9 + 4 = 1.111
1.234 x 9 + 5 = 11.111
12.345 x 9 + 6 = 111.111
123.456 x 9 + 7 = 1.111.111
1.234.567 x 9 + 8 = 11.111.111
12.345.678 x 9 + 9 = 111.111.111
123.456.789 x 9 +10= 1.111.111.111

9 x 9 + 7 = 88
98 x 9 + 6 = 888
987 x 9 + 5 = 8.888
9.876 x 9 + 4 = 88.888
98.765 x 9 + 3 = 888.888
987.654 x 9 + 2 = 8.888.888
9.876.543 x 9 + 1 = 88.888.888
98.765.432 x 9 + 0 = 888.888.888

1 x 1 = 1
11 x 11 = 121
111 x 111 = 12.321
1.111 x 1.111 = 1.234.321
11.111 x 11.111 = 123.454.321
111.111 x 111.111 = 12.345.654.321
1.111.111 x 1.111.111 = 1.234.567.654.321
11.111.111 x 11.111.111 = 123.456.787.654.321
111.111.111 x 111.111.111 = 12.345.678.987.654.321