Here is an interesting and lovely way to look at the beauty of mathematics 1.

The Beauty of Mathematics
Wonderful World
1 x 8 + 1 = 9
12 x 8 + 2 =
98
123 x 8 + 3 =
987
1234 x 8 + 4 =
9876
12345 x 8 + 5 =
987 65
123456 x 8 + 6 =
987654
1234567 x 8 + 7 =
9876543
12345678 x 8 + 8 =
98765432
123456789 x 8 + 9 =
987654321


1 x 9 + 2 =
11
12 x 9 + 3 =
111
123 x 9 + 4 =
1111
1234 x 9 + 5 =
11111
12345 x 9 + 6 =
111111
123456 x 9 + 7 =
1111111
1234567 x 9 + 8 =
11111111
12345678 x 9 + 9 =
111111111
123456789 x 9 +10=
1111111111

9 x 9 + 7 = 88
98 x 9 + 6 =
888
987 x 9 + 5 =
8888
9876 x 9 + 4 =
88888
98765 x 9 + 3 =
888888
987654 x 9 + 2 =
8888888
9876543 x 9 + 1 =
88888888
98765432 x 9 + 0 =
888888888
Brilliant, isn’t it?
1 x 1 = 1
11 x 11 =
121
111 x 111 =
12321
1111 x 1111 =
1234321
11111 x 11111 =
123454321
111111 x 111111 =
12345654321
1111111 x 1111111 =
123456765432111111111 x 11111111 = 123456787654321
111111111 x 111111111 =
12345678987654321

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