Question

Find the square root of 13 correct to four decimal places.​

Answer 1

$\large\mathbb{ANSWER}$

• With a calculator: 3.605551275, so rounded to 3.606 (3dp).

• Without a calculator sqrt (9)=3 and sqrt (16)=4, so start using manual trial and improvement at 3.5 or 3.6 because 13 is about halfway between but closer to 16 than 9.

• EDIT: I forgot to mention that -3.606 (3dp) is also a solution.

hope it helps...

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