1x 9 + 1 = 10

12x 9 + 2 = 110

123x 9 + 3 = 1110

1234x 9 + 4 = 11110

12345x 9 + 5 = 111110

123456x 9 + 6 = 1111110

1234567x 9 + 7 = 11111110

12345678x 9 + 8 = 111111110

123456789x 9 + 9 = 1111111110



AND


1x 8 + 1 = 9

12x 8 + 2 = 98

123x 8 + 3 = 987

1234x 8 + 4 = 9876

12345x 8 + 5 = 98765

123456x 8 + 6 = 987654

1234567x 8 + 7 = 9876543

12345678x 8 + 8 = 98765432

123456789x 8 + 9 = 987654321