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