Binary Multiplication

What is Binary Multiplication? The binary multiplication operation is actually a process of addition and shifting operation and this process has to be continued until all the multiplier is done and finally the addition operation is made. Similar to the decimal system, the multiplication of the binary numbers is done by multiplying the multiplicand with the multiplier. It is noted that the multiplication by zero makes all the bits zero and this step may be ignored in the intermediate steps and the multiplication by 1 makes all the multiplicand value unchanged. In this section you will get answers for the questions about binary multiplication, including:

  • What is Binary multiplication? Procedure to multiply two binary numbers
  • Steps to Solve Binary multiplication using examples

Binary Multiplication Rules

Binary multiplication is much easier than the decimal multiplication when you remember the following multiplication rules:

  • 0 x 0 = 0
  • 0 x 1 = 0
  • 1 x 0 = 0
  • 1 x 1 = 1


Let us look at the examples on binary multiplication:

Example 1: Solve 1010 x 101


1010 x 101


(x) 101





01010 …….First Intermediate Sum




Comparison with Decimal values:

10102 = 1010

10102 = 510

10 x 5 = 5010

(110010)2 = 5010

Another example of binary multiplication with a decimal point is as follows:

Question: 1011.01 x 110.1


Binary Multiplication-steps

Here, the decimal point is placed three places from the least significant bit. Because, the binary number 1011.01, the decimal point is 2 places from the LSB and 110.1 the decimal point is placed 1 place from the LSB.

For more information on binary operations like addition, subtraction, and division operations register with BYJU’S -The Learning App and also watch interesting videos to learn with ease.

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