Multiplication using doubling method

What are the Multiplication using doubling method 

Multiplication is a fundamental arithmetic operation that involves adding a number to itself a certain number of times. The doubling method is a technique that simplifies multiplication by breaking it down into a series of steps involving doubling and addition. This method is particularly useful when dealing with large numbers or when you want to perform mental calculations quickly and efficiently.

Here’s a step-by-step description of the multiplication process using the doubling method:

multiplication by 9


Begin by writing down the two numbers you want to multiply, the multiplicand (the number you’re multiplying) and the multiplier (the number by which you’re multiplying the multiplicand).

Initialize Variables

Set up two variables to keep track of your progress: one for the running total (which starts at 0) and one for the current value of the multiplicand (which starts at the original multiplicand value).


Double the current value of the multiplicand. You can do this by adding the multiplicand to itself. At the same time, record this in a separate column.

double of double

Halve the Multiplier

Divide the multiplier by 2. If it’s an even number, this is straightforward. If it’s an odd number, ignore the remainder. Continue halving until the multiplier becomes 1.

Conditional Addition

For each step, if the current value of the multiplier is odd (i.e., it has a remainder when divided by 2), add the recorded value of the multiplicand (from step 3) to the running total.


Continue steps 3-5 until the multiplier becomes 1. At this point, you have added up all the necessary values, and the running total represents the result of the multiplication.

Final Result

The running total is your final result, which is the product of the original multiplicand and multiplier.

The doubling method works on the principle that any multiplication can be broken down into a series of doublings and conditional additions. This method is particularly efficient because doubling can be done quickly in your head, and the number of additions required is significantly reduced compared to traditional long multiplication.

By using the doubling method, you can perform multiplication more efficiently and gain a deeper understanding of the multiplication process. It’s a valuable tool for mental math and can be applied to a wide range of mathematical problems.