Question

The square root of 4.2025 is

• A. 2.05
• B. 2.15
• C. 2.25
• D. 2.35

Answer 1

The correct option is A

2.05

Here 4.2025 can be written as $\frac{42025}{10000}$

Now, square-root of this will be equal to $\sqrt{\frac{42025}{10000}}$

= $\sqrt{\frac{41\times 41\times 5\times 5}{10\times 10\times \times 10\times 10}}$ (Using prime factorizaion method)

= $\frac{41\times 5}{10\times 10}$

= 2.05