Numbers 1 to 9

Interesting patterns can be obtained by multiplying those numbers.
1 . 1 = 1
11 . 11 = 121
111 . 111 = 12321
1111 . 1111 = 1234321
11111 . 11111 = 123454321
111111 . 111111 = 12345654321
1111111 . 1111111 = 1234567654321
11111111 . 11111111 = 123456787654321
111111111 . 111111111 = 12345678987654321

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

Mathematics

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