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
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