2. Find the area of each square. How do you find the area of each square? Area may be found by either counting the number of units or multiply length of the sides. inches 2 inches

3. The product of a number and itself is the square of the number. So the “square” of 3= 3 2 and 3 2 = 3 x 3, which = 9 What is the “square” of 5? 5 x 5 = 25 the square of 5 is 25 Find the square of 9 Find the square of 4 Find the square of 12 Find the square of 15 9 2 = 9x9 = 81 4 2 = 4x4 = 16 12 2 = 12 x12 = 144 15 2 = 15 x 15 = 225

4. 10 x 10 = 100 ( 100 is a perfect square because it is the square of 10) 7 x 7 = 49 (49 is a perfect square because it is the square of 7) Can you think of another perfect square?

5. The factors multiplied to form perfect squares are called square roots. A radical sign, is the symbol used to indicate the square root of a number ! 4 2 = 4 x4 = 16, so = 4 1616 When dealing with square roots just think: “What number times itself will equal the number inside the radical sign!” The square root of a number is one of its two equal factors. Read as: the square root of 16 equals 4

6. Find the (read as “square root of 25” 25 Find the 81 Think: what number times itself equals 81? 5 x 5 = 25 so the square root of 25 = 5 Find the 900 30 x 30 = 900 so the square root of 900 = 30

7. The product of a number and itself is called the “square” of that number. 3x3=9, so 9 is the square of three! What is the square of 11? 121, because 11 x 11 = 121 9 and 121 are also known as perfect squares because: They are the squares of whole numbers! The square root of a number is one of its two equal factors. The (read) “The square root of 36 is? 36

8. 3 squared = 9, so the square root of 9 is 3