43:2=21 rest 1
21:2=10 rest 1
10:2=5 rest 0
5:2=2 rest 1
2:2=1 rest 0
si citim de jos in sus incepand cu ultimul cat de la primul rest = 0:
43 = 101011
Verificarea nu strica niciodata:
101011(2) = 2^5 + 2^3 + 2^1 + 2^0 = 32 + 8 + 2 + 1 = 43(10), corect.