1:
2:
3:
4:
5:
6:

              123
              |||
  10^ 2=100---+||
  10^ 1= 10----+|
  10^ 0=  1-----+
1*100 + 2*10 + 3*1 = 123

1:
2:
3:
4:
5:
6:

              123
              |||
  16^ 2=256---+||
  16^ 1= 16----+|
  16^ 0=  1-----+
1*256 + 2*16 + 3*1 = 291 (dezimal geschrieben)