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Binary Multiplication

Published on 24/2/2012 & updated on 25/8/2018
We know there are four fundamental operations in arithmetic, addition, subtraction, multiplication and division. We have already discussed about the binary addition and binary subtraction in detail in the previous articles now we are going to discuss about binary multiplication in a detailed manner. As in binary number system there are only 0 and 1 present as digits so we have to know the fundamental interrelation between these two digits during multiplication. Like in case of binary addition and binary multiplication there are also four steps to be followed during a bigger multiplication or we can say these fundamental steps as well.

These are As we can see that if we can compare these rules of binary multiplication with that of decimal multiplication we will not have any difference at all. So it is a comparatively easy method than the previously discussed two operations. Now we will look into the procedure in a more detailed matter and step by step to understand it better.

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Binary Multiplication

Let us take two binary numbers A = 1001 and B = 101 we want to find out A × B This is the first step in this step the least significant bit or the right most bit of B is multiplied with all the digits of A from the right side and the result is written. Here the steps took place are

Similarly in this step all the elements of A are respectively multiplied with the second most significant bit i.e. 0. From the table above we can see that any digit 0 or 1 when multiplied by 0, the result is 0 so all the elements in this step is 0. Now we will proceed to the next step.

In this step the left most digit of B which is 1 is multiplied by all the digits of A and the result is same as that of the first step. Finally all these elements are added and we ultimately get the desired result of binary multiplication. If we look carefully the binary addition method is applied here which is very simple to understand.
Now, where this binary multiplication method is applied in digital electronics. It is applied to calculate the truth table of AND gate which is also discussed in the different article.

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