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12345679 X 9 = 111111111
12345679 X 18 = 222222222
12345679 X 27 = 333333333
12345679 X 36 = 444444444
12345679 X 45 = 555555555
12345679 X 54 = 666666666
12345679 X 63 = 777777777
12345679 X 72 = 888888888
12345679 X 81 = 999999999

0 X 9 + 1 = 1
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 9 X 9 + 9 = 111111111
123456789 X 9 + 10 = 1111111111

9 X 9 + 7 = 88
9 X 98 + 6 = 888
9 X 987 + 5 = 8888
9 X 9876 + 4 = 88888
9 X 98765 + 3 = 888888
9 X 987654 + 2 = 8888888
9 X 9876543 + 1 = 88888888
9 X 98765432 + 0 = 888888888
9 X 987654321 – 1 = 8888888888

11 X 11 = 121
111 X 111 = 12321
1111 X 1111 = 1234321
11111 X 11111 = 123454321
111111 X 111111 = 12345654321
1111111 X 1111111 = 1234567654321
11111111 X 11111111 = 123456787654321
111111111 X 111111111 = 12345678987654321

1 X 8 + 1 = 9
12 X 8 + 2 = 98
123 X 8 + 3 = 987
1234 X 8 + 4 = 9876
12345 X 8 + 5 = 98765
123456 X 8 + 6 = 987654
1234567 X 8 + 7 = 9876543
12345678 X 8 + 8 = 98765432
123456789 X 8 + 9 = 987654321