Number Sysytems

D. W. Chathurika Pavithrani

Uva Wellassa University

Number Systems

724.5 = 7* 102 + 2*101 + 4*100 +5* 10-1

Numbers Systems used in Computer Work

Decimal Binary Octal Hexadecimal

Binary

(11010)2 = 1*24 + 1*23 +0*22 + 1*21 + 0*220= (26) 10

Octal

(127.4)8 = 1*82 + 2*81 + 7*80 + 4*8-

1= (87.5)10

Hexadecimal

First 10 digits from the decimal system

And the letters ▪ A – 10▪ B – 11▪ C – 12▪ D – 13▪ E – 14▪ F - 15

Hexadecimal

(B65F)16 = 11*163 + 6*162 + 5*161 + 15*160 = (46687)10