۹= 1 + 8 × 1

98 = 2 + 8 × 12

987 = 3 + 8 × 123

9876 = 4 + 8 × 1234

98765 = 5 + 8 × 12345

987654 = 6 + 8 × 123456

9876543 = 7 + 8 × 1234567

98765432 = 8 + 8 × 12345678

987654321 = 9 + 8 × 123456789