This is a short, powerpoint introduction to perfect squares and square roots.

1. An Introduction

2. By definition  25 is the number you would multiply times itself to get 25 for an answer. In other words, what times what would give you a product of 25? Because we are familiar with multiplication, we know that  25 = 5, because 5 x 5 = 25. 5 is the square root of 25. Numbers like 25 and 49, which have whole numbers for their square roots, are called perfect squares. You need to memorize at least the first 15 perfect squares. By definition  49 is the number you would multiply times itself to get 49 for an answer. In other words, what times what would give you a product of 49? Because we are familiar with multiplication, we know that  49 = 7, because 7 x 7 = 49 . 7 is the square root of 49.

7. Perfect square Square root 1  1 = 1 4  4 = 2 9  9 = 3 16  16 = 4 25  25 = 5 36  36 = 6 49  49 = 7 64  64 = 8 81  81 = 9 100  100 = 10 121  121 = 11 144  144 = 12 169  169 = 13 196  196 = 14 225  225 = 15 Perfect square Square root