[شتـاءْ]

23/ convert the following binary numbers to decimal without using a calculator , showing your work :
a/(01101)2
b/(1011000)2
c/(011110.01)2
d/(111111.111)2

24/ convert the following hexadecimal numbers to decimal without using a calculator,showing your work :
a/(AB2)16
b/(123)16
c/(ABB)16
d/(35E.E1)16


25/convert the following octal numbers to decimal without using a calculator , showing your work:
a/(237)8
b/(2731)8
c/(617.7)8
d/(21.11)8