1. Find addition of (1001)_{2} and (101)_{2}
   1    1  0  0  1  +  0  1  0  1 
  1  1  1  0 

2. Find Subtraction of (1001)_{2} and (101)_{2}
      0  2     1  0  0  1    0  1  0  1 
  0  1  0  0 

3. Find multiplication of (1001)_{2} and (101)_{2}
1001  × 101   100100  00000  1001   101101 

4. Find division of (1001)_{2} and (101)_{2}
Here, Divisor = 101 Dividend = 1001 Quotient = 1 Remainder = 100

