Table of Contents

## A. Multiply the Big Numbers close to 10, 100, 1000, etc

In this section, we cover the steps to multiply big numbers which are close to numbers like 10, 100, 1000.

**Note: **The base number to address this problem is 100 that is with two zeros. So the final answer is a combination of two numbers with each one having two digits.

### Steps to Multiply Big Numbers

Let us take a simple example before we multiply big numbers. In the below steps we multiple 96 and 97.

**Step1: Identify the Base Number**

In this case, the base number is 100 as both the numbers are of two-digit numbers.

**Step2: Subtract both the numbers from Base Number**

- 100 – 96 => 4 is the first number (N1)
- 100 – 97 => 3 is the second number (N2)

**Step3: Next Derive the sum and multiplication of the numbers N1 and N2**

- Sum of the two numbers is 7 (4+3)
- Multiplication of these two numbers is 12 (4X3)

**Step4: Next Derive the two parts of the Final answer**

- Part1 – Base Number – Sum => 100 – 7 => 93
- Part2 – Multiplication that is 12

*Note: If part2 is a single digit, prefix it with zero to *make

*it a two digit number. For example in 99X98, Part2 will be 2, so you need to make it 02),*

**Step5: Final Answer**

Join both the parts to get the final answer, that is **9312**

### How to Multiply Big Numbers with a template

In this example, we are multiplying 997 and 998. In this case, both the numbers are of 3 digit length, hence the base number would be 1000.

### Download Practice

You can download the following image and print for practice. Practice this problem enough times so that you can do it in your mind without paper.

**B. Multiplay Any Number with 11**

This multiplication is very easy. The number of Digits in the results will be one more than the number which you are multiplying with 11.

### Multiplay one Digit number with 11

We all know this easiest multiplication by muscle memory. Just repeat the number, for example, 8X11 = 88

### Multiplay a two Digit number with 11

In this case, the result will be a three digit number.

Step1: Write down both the numbers leaving one number gap between

Step2: Add both the numbers and write down in the middle gap. In case the sum is more than 9, add one to the left number.

### Multiply a three Digit Number with 11

*This method will apply for any number with any number of digits. Actually, in the above pictures for a two digit number, the same method was used. The Result will have write 4 digits, so keep four boxes.*

**Step1:** Write first and last digits in first and last boxes.

**Step2:** Add each paid of numbers and keep the sum in the middleboxes. In case the sum exceeds 9, Carry 1 to the previous box.

**Final Words**

keep watching this space, for more Math Hacks like this. We request you to share your feedback and suggestions in the comments section.