Question

multiple 0011 and 1011 in binary system

Answer 1

'Multyple' operation in binary system is simple: when the both components are '1' result will be '1', otherwise result will be '0'.
     0011
x
     1011
-----------
     1011
+
    1011
+      0
+      0
----------------
     100001
PS/ 1+1=10; 0+0=0; 1+0=1; 1011*1=1011; 1011*0=0