What is the square root of - 16?

0-81

041

OO

Answer: 4 i

Finding square roots of of numbers that aren't perfect squares without a calculator.

Example: Calculate the square root of 10 () to 2 decimal places.

Find the two perfect square numbers it lies between.

Divide 10 by 3.

Average 3.33 and 3. ( ...

Repeat step 2: 10/3.1667 = 3.1579.