MAGIC OF MATHEMATICS

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