Magic calculation

It all adds up... to 9

1x9=09 =0+9=9

2x9=18 =1+8=9

3x9=27 =2+7=9

4x9=36 =3+6=9

5x9=45 =4+5=9

6x9=54 =5+4=9

7x9=63 =6+3=9

8x9=72 =7+2=9

10 x 9 = 90 = 9 + 0 = 9

One, two, three

1 x 1 = 1

11 x 11 = 121

111 x 111 = 12321

1111 x 1111 = 1234321

11111 x 11111 = 123454321

111111 x 111111 = 12345654321

1111111 x 1111111 = 1234567654321

11111111 x 11111111 = 123456787654321

111111111 x 111111111 = 12345678987654321

1 x 9 + 2 = 11

12 x 9 + 3 = 111

123 x 9 + 4 = 1111

1234 x 9 + 5 = 11111

12345 x 9 + 6 = 111111

123456 x 9 + 7 = 1111111

1234567 x 9 + 8 = 11111111

12345678 x 9 + 9 = 111111111

123456789 x 9 +10 = 1111111111