How can we organize our data? What other combinations can we make? What do we expect will happen? CPM Materials modified by Mr.
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1 Common Core Standard: 8.EE.2, 8.G.6 How can we organize our data? What other combinations can we make? What do we expect will happen? CPM Materials modified by Mr. Deyo
2 Title: IM8 Ch How Can I Find The Side Length? Date: Learning Target By the end of two periods, I will apply the definitions of a square root and an irrational number to find values of square roots by estimation, by using a calculator, and by using a graph. I will demonstrate this by completing Four Square notes and by solving problems in a pair/group activity.
3 Home Work: Sec Desc. Date Due Review & Preview Day 1: 4 Problems 9 88, 9 90, 9 91, 9 92 Day 2: 4 Problems 9 93, 9 94, 9 96, 9 99
4
5 1) squared Vocabulary 2) square root 3) rational number 4) irrational number
6
7 9.2.3 How Can I Find The Side Length? You have developed a way to decide if a triangle is a right triangle by looking at the squares of the side lengths of the triangle. If you already know a triangle is a right triangle, how can the Pythagorean Theorem help you determine the length of a leg or the hypotenuse? Today you and your team will develop new ways to find missing lengths of right triangles Nikita wants to use the area of the squares idn the figure here to find the lengths of the sides of a right triangle. a) Find the missing area. b) What are the lengths of the legs of the right triangle in Nikita s diagram? How do you know? c) About how long is the hypotenuse? Are you able to find the length exactly? Explain your reasoning.
8 9 81 The numbers 36, 64, 4, 16, 100, 144, 121, and 225 are all examples of perfect squares a) If each of these numbers represents the number of square units in a square, what is the side length of each square? b) Why do you think these numbers are called perfect squares?
9 9 82 To find the side length of a square with a particular area, you use an operation called the square root. The square root symbol looks like this:. It is also called a radical sign. To find the side length of a square with an area of 81 square units, for example, you would write and would read is as "the square root of 81." Since 9 9 = 81, then = 9. Copy each square root expression below. Rewrite each square root as an equivalent expression without the radical sign. Explain your method for finding the square root of these numbers. a) b) c) d)
10 9 83 In problem 9 74, you tried to make a perfect square with 24 tiles and could not. a) Why was it not possible? b) Estimate the length of a side of a square with an area of 24 square units. What two whole numbers is the length between? c) Is closer to one of the whole numbers or to the other? If you did not already do so, estimate to the nearest tenth. d) Multiply your estimate by itself. How close to 24 is your answer? If you revised your estimate, how would you change it?
11 9 84 Between which two whole numbers is each of the following square roots? To which whole number do you think it is closer? Estimate the value of the square root to the nearest tenth (0.1). You may find it helpful to create a list of the whole numbers from 1 to 17 and their squares to use with this kind of problem. a) b) c) d) e) f) g) Describe your method for estimating the approximate value of a square root when the number is not a perfect square. Check each estimate for parts (a) through (f) on a calculator.
12 9 85. ESTIMATING WITH A GRAPH % %20RP.pdf In Chapters 6, 7, and 8, you examined the graphs of various relationships. What would the relationship between the side length of a square and the area of a square look like on a graph? a) Complete the table for the side lengths and areas. Graph the points. Does it make sense to connect them? If so, connect them with a smooth curve.
13 9 85. ESTIMATING WITH A GRAPH % %20RP.pdf b) Describe the relationship between the side length of a square and the area of the square. How is it the same or different than other relationships you have graphed? c) How can you use the graph to estimate the side length for a square with an area of 24 square units? Does this estimate match your estimate in problem 9 83? d) Use your graph to estimate these square roots: i) ii) iii) iv)
14 9 86. Additional Challenge: Nikita wonders, What can we say about the square root of a negative number? Discuss this question with your team. For example, can you find? Write an explanation of your thinking. Be ready to share your ideas with the class.
15 9 87. LEARNING LOG: "Square Roots" Date: What is a square root? How can you estimate a square root? In your Learning Log, write directions for a fifth grader to follow. Explain what a square root is and how to estimate a square root to the nearest tenth. Include examples of perfect squares and non perfect squares.
16 9 88a,b. Find the missing length or area. chapter/ch9/lesson/9. a) b)
17 9 88c,d. Find the missing length or area. chapter/ch9/lesson/9. c) d)
18 9 89. Determine the positive value that makes each equation true. If the answer is not a whole number, write it as a square root, and then approximate it as a decimal rounded to the nearest tenth. chapter/c a) If x 2 = 36, x =? b) If x 2 = 65, x =? c) If x 2 = 84, x =? d) If x 2 = 13, x =?
19 9 90. Use the rule y = 2x + 5 to answer the questions chapter/ch9/lesson/9.2.3/pro a) What is the slope of the line? m = y = ( 2)x + (5) b) Where does the line cross the y axis? ( 0, ) c*) Graph the equation
20 9 91 Complete each of the Diamond Problems below. The pattern used in the Diamond Problems is shown here. homework/homework/category/cc/textbook/cc3/ chapter/ch9/lesson/9.2.3/problem/9 91 a) b) c) d)
21 9 92. Identify which of the relationships shown below is not a function. Explain your reasoning. chapter/ch9/lesson/9.2 a) b)
22 chapter/ch9/lesson/9.2. Kenneth claims that (2, 0) is the point of intersection of the lines: y = 2x + 4 and y = x 2. Is he correct? How do you know?
23 9 94. Daniel needed to paint his patio, so he made a scale drawing of it. He knows that the width of the patio is 10 feet, but the scale drawing is in inches. a) Find the length of the patio in feet. homework/homework/category/cc/textbook/cc3/ chapter/ch9/lesson/9.2.3/problem/9 94 b) Find the area of the patio so Daniel knows how much area he needs to paint. c) One can of paint covers 125 square feet. How many cans of paint will Daniel need to buy?
24 9 95. Juan found that 20 new pencils weigh 12 ounces. How much will 50 new pencils weigh? homework/homework/category/cc/textbook/cc3/ chapter/ch9/lesson/9.2.3/problem/9 95
25 9 96a,b. For each diagram below, solve for x. Explain what method you used for each problem. a) b) chapter/ch9/lesson/9.2
26 9 96c,d. For each diagram below, solve for x. Explain what method you used for each problem. c) d) chapter/ch9/lesson/9.2
27 9 97. Find the surface area and volume of the rectangular prism here. homework/homework/category/cc/textbook/cc3/ chapter/ch9/lesson/9.2.3/problem/9 97 Surface Area Volume
28 9 98. Find the area of each circle below. chapter/ch9/lesson/9 a) b) radius = 8cm
29 9 99. Write each number in scientific notation. homework/homework/c chapter/ch9/lesson/9.2.3/problem/9 99 a) = _. x10 b) = c) 3,120,000,000 =
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