Estimating square root

This document provides instructions for estimating square roots without using a calculator. It explains that to estimate square roots: 1) You must know your perfect squares, which are numbers that are the product of a number multiplied by itself. 2) For numbers that are not perfect squares, the square root is estimated by finding the two adjacent perfect squares between which it falls and interpolating between them to the nearest tenth. 3) Examples are provided to demonstrate how to estimate the square roots of 27 and 64 by finding the nearest perfect squares and interpolating between them on a number line.