Square Root Tricks.\rbrFor finding square root of complete squares, we must memorize the squares of numbers 1 to 9.\rbrSquares of 1 and 9 have 1 in the units place.\rbrSquares of 2 and 8 have 4 in the units place.\rbrSquares of 3 and 7 have 9 in the units place.\rbrSquares of 4 and 6 have 6 in the units place.\rbrSquares of 5 have 5 in the units place.\rbrWe use these fs to find square roots.