Finding Squares of Numbers ending in 5 in less than 5 seconds!!!

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Hi Aspirants,

Here we are giving you a few traps which can be useful to understand Quant questions. These can be connected to tackling the inquiries.

Example 1:

What is Square of 45?

Step 1: Divide 45 into 4 / 5.

Step 2 (LHS): The next consecutive digit of 4 is 5. So Multiply 4 with 5. ie 20.

Step 3: 20/Square of 5 ie 25 (RHS is always 25)

Answer is 2025.

Example 2:

What is the Square of 65?

Step 1: 6 / 5.

Step 2: 6 x 7 = 42. (LHS)

Step 3: 42 / 25

The Answer is 4225

Example 3:

What is the Square of 95?

Step 1: 9 / 5

Step 2: 9 x 10 = 90 (LHS)

Step 3: 90 / 25

The Answer is 9025

Similarly,

Square of 25 = 2 x 3 / 5 x 5 = 6 / 25 = 625.

Square of 125 = 12 x 13/ 5 x 5 = 156 / 25 = 15625.

Square of 505 = 50 x 51/ 5 x 5 = 2550 / 25 = 255025.

 

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