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SQUARES & SQUARE ROOTS Squares •Square of a number: “Squaring” a number means to raise a number to the second power. Example: 4² = 4 · 4 = 16 9² = 9 · 9 = 81 16² = 16 · 16 = 256 Square Roots The Square Root of a number is the number you can multiply by itself to give you that number. Thus, Try: = 2, because 22=4 = 3, because 32=9 = 8, because 82=64 = 12, because 122=144 = 1, because 12 = 1 = 0, because 02 = 0 Perfect Squares A Perfect Square: is “perfect” because its square root is a whole number. Example: 49 is a perfect square because =7 Non-Perfect Squares A Non-Perfect Square: is a number whose square root is NOT a whole number. Example: 40 is NOT a perfect square because = 6.3245… Approximating Square Roots You need to estimate its value of nonperfect squares by determining which two perfect squares it falls in between. Example: 11 is a non-perfect square 11 falls between perfect squares 9 & 16 Therefore, is between and Since, = 3 and =4 Then is between 3 and 4 Find the two consecutive numbers the following non-perfect square fall between. SHOW WORK! √55 and Between 7 & 8 √23 and Between 4 & 5 √5 and Between 2 & 3 √14 and Between 3 & 4 √44 and Between 6 & 7 Answer the following problem SHOW WORK! 1. I am a number. I am not zero. If I am squared, I’m still the same number. What number am I? 1 Answer the following problem SHOW WORK! 2. If a square bedroom has an area of 144 square feet, what is the length of one wall? 12 feet Answer the following problem SHOW WORK! 3. An artist is making two stainedglass windows. One window has a perimeter of 48 inches. The other window has an area of 110 inches. Which window is bigger? The window with a perimeter of 48 inches. Answer the following problem SHOW WORK! 4. A square garden has an area of 225 square feet. How much fencing will a gardener need to buy in order to place fencing around the garden? 60 feet