Quantitative Aptitude - SPLessons

Two Digit-Three Digit Numbers Product

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Two Digit-Three Digit Numbers Product

shape Introduction

How to Quickly Calculate the Product of a 2-digit and 3-digit Number
In this article, we will be studying various tricks to calculate the Two Digit-Three Digit Numbers Product. We will understand this method using examples. We choose the base to be 100.

shape Short Cuts

Example 1:
Find the product of 97 × 107 = ?
Step 1: Find the difference of the numbers with respect to 100.

Step 2: Add first number with the difference of the other. We get 97 + (+7) = 104.

Step 3: Multiply the result of Step 2 with 100. We get 104 × 100 = 10400.
Step 4: Multiply the differences obtained in Step 1.

Step 5: Add the results obtained in Step 3 and Step 4 to get the answer.
∴ The answer is 10400 + (-21) = 10379.
Example 2:
Find the product of 88 × 111 =?
Step 1: Find the difference of the numbers with respect to 100.

Step 2: Add first number with the difference of the other. We get 111 + (-12) = 99.

Step 3: Multiply the result of Step 2 with 100. We get 99 × 100 = 9900.
Step 4: Multiply the differences obtained in Step 1.

We get (+11) × (-12) = -132.
Step 5: Add the results obtained in Step 3 and Step 4 to get the answer.
∴ The answer is 9900 + (-132) = 9768.

shape Exercises

1. Find the product of 88 × 106.
2. Find the product of 99 × 111.
3. Find the product of 109 × 91.
Answers:
    1. 9328
    2. 10989
    3. 9919