Squares

Squares Example: Square of a = a2 = a x a Square of 4 = 42 = 4 x 4 “Squaring” a number means to raise a number to the second power Example: Square of a = a2 = a x a Square of 4 = 42 = 4 x 4 Square of 9 = 92 = 9 x 9 Square of 16 = 162 = 16 x 16

Squares of Number upto 20 (need to be thorough) Numbers Squares Numbers Squares 1 1 11 121 2 4 12 144 3 9 13 169 4 16 14 196 5 25 15 225 6 36 16 256 7 49 17 289 8 64 18 324 9 81 19 361 10 100 20 400

Square of a rational number

Square of a fraction Example: Square of a decimal number 0.52 = 0.5 x 0.5 =0.25 0.122 = 0.12 x 0.12 =0.0144

By multiplication rule of integers, - x - = + Square of a negative number (-6)2 = -6 x -6 = + 36 (-0.4)2 = -0.4 x -0.4 = + 0.16 By multiplication rule of integers, - x - = +

Try these Find the square of the following numbers 6 -14 0.5