Question

The positive square root of 0.9 is
(a) 0.3 exactly
(b) 0.03 exactly
(c) 0.33 approx.
(d) 0.95 approx.
Explanation needed!!!

Answer 1

D is the correct answer...
0.95 approx.



I will share the method that I use because it is the easiest that I have learnt. This method can be applied only if you have a thorough knowledge of the perfect squares. We will take a number say 105. To find its square root, proceed as under:

Find the closest perfect square to it. Here, it is 100.

Find square root of that number, i.e. 100. We know the square root is 10.

Divide the number by the square root calculated above. Here, 105÷10.

Take the mean of the result obtained above and the square root in step 2. Here, (10+10.5)/2 = 10.25

The number obtained above is the square root of the required number.

Let's take another example, say 420.

Closest perfect square is 400.

Square root of 400 is 20.

420÷20 is 21.

Mean of 20 and 21 is 20.5

Square root of 420 is 20.5

Hope it'll help u

Answer 2

Ans (d) 0.95

Follow square root

| 0.90 |