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Question

Find square root of 5 correct to 3 decimal places


Solution

I will explain how 42 came. 

After doing the first step, we get quotient =2

Whatever the quotient, double it(multiply it with 2)

That's how we get 4

Now use different combinations of two digit numbers with ten's digit 4  such that number multiplied with its unit place number is less than the obtained remainder. 

Here we get 42*2 < 100

2 is the unit place's number 

Eg:43*3 >100
      44*4>100

 So that's how 42 came

So by trial and error method we must find units place

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