Binary multiplication how to carry a 001 in case of adding 4 times 1?

Question

I am doing binary arithmetic for the first time and I want to know how to carry over 1+1+1+1 in binary multiplication $$\begin{align} &1101000\\ &0101100\\ &1011000\\ &0001000\\ \end{align}$$

now the fourth column has 1+1+1+1=100, How can I carry it to the next column or any other such number 5=101 thanks.

Answer 1

$1+1+1+1=100$, so it carries like this:

     10  
    1101000  
    0101100  
    1011000  
    0001000  
    -------  
       0100

Here I’ve shown only what you have after dealing with the four leftmost columns.