Question

To find the square of $45$ by Ekadhikena Purvena method the digit $4$ should be multiplied by which number.

• A. By its previous number
• B. By zero
• C. By its next number
• D. By ten

Answer 1

The correct option is C By its next number

In ekadhikena purvena the first digit is multiplied by its next number.

${45}^2\Rightarrow$ First 2 digits $=4\times 5$

and last two digits are$=5^2=25\Rightarrow {45}^2=2025$