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An Introduction 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. 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. 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. a RADICAL – The symbol that is used to indicate square roots. 9 is 3 because 3 times 3 is 9 Think to yourself…. WHAT TIMES WHAT will give me the number inside the radical symbol????? 16 16 is 4 because 4 times 4 is 16. Practice makes perfect in math!!!! You need to memorize the first 15 perfect squares. Copy the chart on the next slide on notebook paper. Study it! Know it! There will be a quiz! Perfect square Square root Perfect square Square root 1 1 = 1 81 81 = 9 4 4 = 2 100 100 = 10 9 9 = 3 121 121 = 11 16 16 = 4 144 144 = 12 25 25 = 5 169 169 = 13 36 36 = 6 196 196 = 14 49 49 = 7 225 225 = 15 64 64 = 8