Polygons and Area. Overview. Grade 6 Mathematics, Quarter 4, Unit 4.1. Number of instructional days: 12 (1 day = minutes)


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1 Grade 6 Mathematics, Quarter 4, Unit 4.1 Polygons and Area Overview Number of instructional days: 12 (1 day = minutes) Content to be learned Calculate the area of polygons by composing into rectangles and decomposing into triangles. Develop and justify formulas for finding the area of triangles, special quadrilaterals, and other polygons. Draw polygons in the coordinate plane given the coordinates. Find side lengths of polygons on a coordinate plane using the corresponding (x, y) coordinates. Apply these techniques of composing and decomposing to solve realworld and mathematical problems involving area of polygons. Mathematical practices to be integrated Make sense of problems and persevere in solving them. Compose and decompose figures using manipulatives and drawings. Recognize the relationship of triangles and special quadrilaterals to rectangles. Use knowledge of the area of rectangles to find the area of other figures. Model with mathematics. Apply mathematics to everyday situations. Analyze relationship to draw conclusions about area. Use appropriate tools strategically. Use the grid on a coordinate plane to find side lengths. Use rulers and other measuring tools to draw and measure figures on a coordinate plane. Use math knowledge to estimate area. Attend to precision. Use specific units of measure and label appropriately. Use math vocabulary to communicate mathematical thinking effectively. 37
2 Grade 6 Mathematics, Quarter 4, Unit 4.1 Polygons and Area (12 days) Essential questions What is area? Where in the real world would you use the concept of area? How can it be applied and solved? How can you find the area of triangles, special quadrilaterals, and polygons? What does it mean to compose and decompose a figure to create other polygons? How do you find the side length of a figure on a coordinate plane? What are the methods for finding the area of triangles and rectangles? How are they related? How can you use the area of triangles and rectangles to find the area of other polygons? Written Curriculum Common Core State Standards for Mathematical Content Geometry 6.G Solve realworld and mathematical problems involving area, surface area, and volume. 6.G.1 6.G.3 Find the area of right triangles, other triangles, special quadrilaterals, and polygons by composing into rectangles or decomposing into triangles and other shapes; apply these techniques in the context of solving realworld and mathematical problems. Draw polygons in the coordinate plane given coordinates for the vertices; use coordinates to find the length of a side joining points with the same first coordinate or the same second coordinate. Apply these techniques in the context of solving realworld and mathematical problems. Common Core Standards for Mathematical Practice 1 Make sense of problems and persevere in solving them. Mathematically proficient students start by explaining to themselves the meaning of a problem and looking for entry points to its solution. They analyze givens, constraints, relationships, and goals. They make conjectures about the form and meaning of the solution and plan a solution pathway rather than simply jumping into a solution attempt. They consider analogous problems, and try special cases and simpler forms of the original problem in order to gain insight into its solution. They monitor and evaluate their progress and change course if necessary. Older students might, depending on the context of the problem, transform algebraic expressions or change the viewing window on their graphing calculator to get the information they need. Mathematically proficient students can explain correspondences between equations, verbal descriptions, tables, and graphs or draw diagrams of important features and relationships, graph data, and search for regularity or trends. Younger students might rely on using concrete objects or pictures to help conceptualize and solve a problem. Mathematically proficient students check their answers to problems using a different method, and they continually ask themselves, Does this make sense? They can understand the approaches of others to solving complex problems and identify correspondences between different approaches. 38
3 Grade 6 Mathematics, Quarter 4, Unit 4.1 Polygons and Area (12 days) 4 Model with mathematics. Mathematically proficient students can apply the mathematics they know to solve problems arising in everyday life, society, and the workplace. In early grades, this might be as simple as writing an addition equation to describe a situation. In middle grades, a student might apply proportional reasoning to plan a school event or analyze a problem in the community. By high school, a student might use geometry to solve a design problem or use a function to describe how one quantity of interest depends on another. Mathematically proficient students who can apply what they know are comfortable making assumptions and approximations to simplify a complicated situation, realizing that these may need revision later. They are able to identify important quantities in a practical situation and map their relationships using such tools as diagrams, twoway tables, graphs, flowcharts and formulas. They can analyze those relationships mathematically to draw conclusions. They routinely interpret their mathematical results in the context of the situation and reflect on whether the results make sense, possibly improving the model if it has not served its purpose. 5 Use appropriate tools strategically. Mathematically proficient students consider the available tools when solving a mathematical problem. These tools might include pencil and paper, concrete models, a ruler, a protractor, a calculator, a spreadsheet, a computer algebra system, a statistical package, or dynamic geometry software. Proficient students are sufficiently familiar with tools appropriate for their grade or course to make sound decisions about when each of these tools might be helpful, recognizing both the insight to be gained and their limitations. For example, mathematically proficient high school students analyze graphs of functions and solutions generated using a graphing calculator. They detect possible errors by strategically using estimation and other mathematical knowledge. When making mathematical models, they know that technology can enable them to visualize the results of varying assumptions, explore consequences, and compare predictions with data. Mathematically proficient students at various grade levels are able to identify relevant external mathematical resources, such as digital content located on a website, and use them to pose or solve problems. They are able to use technological tools to explore and deepen their understanding of concepts. 6 Attend to precision. Mathematically proficient students try to communicate precisely to others. They try to use clear definitions in discussion with others and in their own reasoning. They state the meaning of the symbols they choose, including using the equal sign consistently and appropriately. They are careful about specifying units of measure, and labeling axes to clarify the correspondence with quantities in a problem. They calculate accurately and efficiently, express numerical answers with a degree of precision appropriate for the problem context. In the elementary grades, students give carefully formulated explanations to each other. By the time they reach high school they have learned to examine claims and make explicit use of definitions. Clarifying the Standards Prior Learning In grade 3, students recognized that area is related to multiplication and addition, and they used tiling to show the area of rectangles by counting unit squares. In grade 5, students understood that attributes belonging to a category of twodimensional figures also belong to all subcategories of that category. 39
4 Grade 6 Mathematics, Quarter 4, Unit 4.1 Polygons and Area (12 days) Current Learning Students compose and decompose figures to find and relate area to rectangles. They apply these techniques to solve realworld and mathematical problems. Students also use the coordinate plane to find the side lengths of figures using the vertices. This is a supporting cluster according to PARCC. (p. 30) This is a critical area according to the CCSS. Future Learning In grade 7, students will find the area, volume, and surface area of two and threedimensional figures composed of triangles, quadrilaterals and polygons, cubes, and right prisms to solve realworld and mathematical problems. Additional Findings According to the Curriculum Focal Points for Prekindergarten through Grade 8 Mathematics, problems involving area and volumes, calling on students to find areas or volumes from lengths or to find lengths from volumes or area and lengths, are especially appropriate. These problems extend the students work in grade 5 on area and volume and provide a context for applying new work with equations. (p. 36) According to Principles and Standards for School Mathematics, students should be able to precisely describe, classify, and understand relationships among types of two and threedimensional objects using their defining properties. (p. 232) 40
5 Grade 6 Mathematics, Quarter 4, Unit 4.2 Surface Area and Volume Overview Number of instructional days: 14 (1 day = minutes) Content to be learned Find the volume of a right rectangular prism with fractional lengths by packing it with unit cubes. Understand that equivalent volumes can be found either when you pack it with unit cubes or use the formula. Apply the formula V = lwh and V = Bh to find volumes of right rectangular prisms with fractional side lengths in realworld and mathematical problems. Use nets made up of rectangles and triangles to represent threedimensional figures to find surface area. Find the surface area of prisms and pyramids by decomposing them into pieces whose area can be determined. (This is a critical area of the CCSS. [p. 40]) Essential questions What is the difference between volume and surface area? Where in the real world would you use the concept of volume? How can it be applied and solved? How can a threedimensional figure be made into a net? Mathematical practices to be integrated Make sense of problems and persevere in solving them. Analyze threedimensional figures to find volume and surface area. Model with mathematics. Apply the volume formula to realworld and mathematical problems. Use and apply knowledge of area of twodimensional figures to surface area. Use manipulatives such as cubes and nets to calculate the volume and surface area. Attend to precision. Use specific units of measure and label appropriately. Use math vocabulary to communicate mathematical thinking effectively. Accurately compute volume and surface area. How can a net be used to find surface area? How does area relate to surface area? How can volume be found? 41
6 Grade 6 Mathematics, Quarter 4, Unit 4.2 Surface Area and Volume (14 days) Written Curriculum Common Core State Standards for Mathematical Content Geometry 6.G Solve realworld and mathematical problems involving area, surface area, and volume. 6.G.2 6.G.4 Find the volume of a right rectangular prism with fractional edge lengths by packing it with unit cubes of the appropriate unit fraction edge lengths, and show that the volume is the same as would be found by multiplying the edge lengths of the prism. Apply the formulas V = l w h and V = b h to find volumes of right rectangular prisms with fractional edge lengths in the context of solving realworld and mathematical problems. Represent threedimensional figures using nets made up of rectangles and triangles, and use the nets to find the surface area of these figures. Apply these techniques in the context of solving realworld and mathematical problems. Common Core Standards for Mathematical Practice 1 Make sense of problems and persevere in solving them. Mathematically proficient students start by explaining to themselves the meaning of a problem and looking for entry points to its solution. They analyze givens, constraints, relationships, and goals. They make conjectures about the form and meaning of the solution and plan a solution pathway rather than simply jumping into a solution attempt. They consider analogous problems, and try special cases and simpler forms of the original problem in order to gain insight into its solution. They monitor and evaluate their progress and change course if necessary. Older students might, depending on the context of the problem, transform algebraic expressions or change the viewing window on their graphing calculator to get the information they need. Mathematically proficient students can explain correspondences between equations, verbal descriptions, tables, and graphs or draw diagrams of important features and relationships, graph data, and search for regularity or trends. Younger students might rely on using concrete objects or pictures to help conceptualize and solve a problem. Mathematically proficient students check their answers to problems using a different method, and they continually ask themselves, Does this make sense? They can understand the approaches of others to solving complex problems and identify correspondences between different approaches. 4 Model with mathematics. Mathematically proficient students can apply the mathematics they know to solve problems arising in everyday life, society, and the workplace. In early grades, this might be as simple as writing an addition equation to describe a situation. In middle grades, a student might apply proportional reasoning to plan a school event or analyze a problem in the community. By high school, a student might use geometry to solve a design problem or use a function to describe how one quantity of interest depends on another. Mathematically proficient students who can apply what they know are comfortable making assumptions and approximations to simplify a complicated situation, realizing that these may need revision later. They are able to identify important quantities in a practical situation and map their relationships using such tools as diagrams, twoway tables, graphs, flowcharts and formulas. They can analyze those relationships mathematically to draw conclusions. They routinely interpret their mathematical results in the context of 42
7 Grade 6 Mathematics, Quarter 4, Unit 4.2 Surface Area and Volume (14 days) the situation and reflect on whether the results make sense, possibly improving the model if it has not served its purpose. 6 Attend to precision. Mathematically proficient students try to communicate precisely to others. They try to use clear definitions in discussion with others and in their own reasoning. They state the meaning of the symbols they choose, including using the equal sign consistently and appropriately. They are careful about specifying units of measure, and labeling axes to clarify the correspondence with quantities in a problem. They calculate accurately and efficiently, express numerical answers with a degree of precision appropriate for the problem context. In the elementary grades, students give carefully formulated explanations to each other. By the time they reach high school they have learned to examine claims and make explicit use of definitions. Clarifying the Standards Prior Learning In grade 5, students recognized and defined the properties of a unit cube. They found the volume of right rectangular prisms with wholenumber lengths using unit cubes and used the formula V = lwh or V = Bh. Students related volume to multiplication and repeated addition to solve realworld and mathematical problems. In addition, they found total volumes by combining rectangular prisms through addition. Current Learning In grade 6, students learn to find the volume of a threedimensional figure using the formula and manipulatives in the context of realworld and mathematical problems. They represent threedimensional figures using nets made up of rectangles and triangles. Students use the nets to find the surface area of these figures. This is a supporting cluster according to PARCC and a critical area according to the CCSS. Future Learning In grade 7, students will work with angle measure, area, surface area, and volume of right prisms. They will acquire a welldeveloped set of geometric skills. Students will know the formulas and use them to solve problems. In grade 8, students will know the formulas for the volume of cones, cylinders, and spheres. They will use the formulas to work and solve mathematical and realworld problems. Additional Findings According to the Curriculum Focal Points for Prekindergarten through Grade 8 Mathematics, problems that involve area and volume (finding area or volumes from lengths or finding lengths from volume or area and lengths) are especially appropriate. (p. 36) According to Principles and Standards for School Mathematics, students use twodimensional representations of threedimensional objects to visualize and solve problems such as those involving volume. They use visual tools such as networks to represent and solve problems. Students recognize and apply geometric ideas and relationships in areas outside the mathematics classroom such as art, science, and everyday life, (i.e., volume). (p. 232) 43
8 Grade 6 Mathematics, Quarter 4, Unit 4.2 Surface Area and Volume (14 days) 44
9 Grade 6 Mathematics, Quarter 4, Unit 4.3 Statistical Variability and Graphing Overview Number of instructional days: 10 (1 day = minutes) Content to be learned Understand that a statistical question anticipates variability. Understand that data collected can be described by its distribution at the center, spread, and overall shape. Understand measure of center (mean and median) and find the interquartile range of a set of data on a graph to describe a pattern for a deviation from the pattern. Organize, display, and interpret data on a number line, dotplot, histogram and boxplot. Analyze sets of data, describe the attributes, and summarize patterns and trends. Mathematical practices to be integrated Make sense of problems and persevere in solving them. Give examples and nonexamples of statistical situations Explain relationships between graphs and tables and search for trends. Construct viable arguments and critique the reasoning of others. Make inferences about data distributions using evidence from graphs. Determine relevance of the graph to the real world. Use appropriate tools strategically. Determine which graph should be used to display data in a given situation. Essential questions What is a statistical question? How can you use measures of center, spread, and overall shape to describe a set of collected numerical data? What are the measures of center? How are they significant to a set of data? What is statistical variability? How is it used to describe a set of data? Look for and make use of structure. Find patterns in graphs and what observations and conclusions can be made. Use data to highlight distributions of data, including outliers, clusters, and gaps. When is it appropriate to use dotplots, histograms, and boxplots? How is data displayed in various graphs? Given a set of data, how can the data be displayed and plotted appropriately? 45
10 Grade 6 Mathematics, Quarter 4, Unit 4.3 Statistical Variability and Graphing (10 days) Written Curriculum Common Core State Standards for Mathematical Content Statistics and Probability 6.SP Develop understanding of statistical variability. 6.SP.1 6.SP.2 6.SP.3 Recognize a statistical question as one that anticipates variability in the data related to the question and accounts for it in the answers. For example, How old am I? is not a statistical question, but How old are the students in my school? is a statistical question because one anticipates variability in students ages. Understand that a set of data collected to answer a statistical question has a distribution which can be described by its center, spread, and overall shape. Recognize that a measure of center for a numerical data set summarizes all of its values with a single number, while a measure of variation describes how its values vary with a single number. Summarize and describe distributions. 6.SP.4 6.SP.5 Display numerical data in plots on a number line, including dot plots, histograms, and box plots. Summarize numerical data sets in relation to their context, such as by: a. Reporting the number of observations. b. Describing the nature of the attribute under investigation, including how it was measured and its units of measurement. c. Giving quantitative measures of center (median and/or mean) and variability (interquartile range and/or mean absolute deviation), as well as describing any overall pattern and any striking deviations from the overall pattern with reference to the context in which the data were gathered. d. Relating the choice of measures of center and variability to the shape of the data distribution and the context in which the data were gathered. Common Core Standards for Mathematical Practice 1 Make sense of problems and persevere in solving them. Mathematically proficient students start by explaining to themselves the meaning of a problem and looking for entry points to its solution. They analyze givens, constraints, relationships, and goals. They make conjectures about the form and meaning of the solution and plan a solution pathway rather than simply jumping into a solution attempt. They consider analogous problems, and try special cases and simpler forms of the original problem in order to gain insight into its solution. They monitor and evaluate their progress and change course if necessary. Older students might, depending on the context of the problem, transform algebraic expressions or change the viewing window on their graphing calculator to get the information they need. Mathematically proficient students can explain correspondences between equations, verbal descriptions, tables, and graphs or draw diagrams of important features and 46
11 Grade 6 Mathematics, Quarter 4, Unit 4.3 Statistical Variability and Graphing (10 days) relationships, graph data, and search for regularity or trends. Younger students might rely on using concrete objects or pictures to help conceptualize and solve a problem. Mathematically proficient students check their answers to problems using a different method, and they continually ask themselves, Does this make sense? They can understand the approaches of others to solving complex problems and identify correspondences between different approaches. 3 Construct viable arguments and critique the reasoning of others. Mathematically proficient students understand and use stated assumptions, definitions, and previously established results in constructing arguments. They make conjectures and build a logical progression of statements to explore the truth of their conjectures. They are able to analyze situations by breaking them into cases, and can recognize and use counterexamples. They justify their conclusions, communicate them to others, and respond to the arguments of others. They reason inductively about data, making plausible arguments that take into account the context from which the data arose. Mathematically proficient students are also able to compare the effectiveness of two plausible arguments, distinguish correct logic or reasoning from that which is flawed, and if there is a flaw in an argument explain what it is. Elementary students can construct arguments using concrete referents such as objects, drawings, diagrams, and actions. Such arguments can make sense and be correct, even though they are not generalized or made formal until later grades. Later, students learn to determine domains to which an argument applies. Students at all grades can listen or read the arguments of others, decide whether they make sense, and ask useful questions to clarify or improve the arguments. 5 Use appropriate tools strategically. Mathematically proficient students consider the available tools when solving a mathematical problem. These tools might include pencil and paper, concrete models, a ruler, a protractor, a calculator, a spreadsheet, a computer algebra system, a statistical package, or dynamic geometry software. Proficient students are sufficiently familiar with tools appropriate for their grade or course to make sound decisions about when each of these tools might be helpful, recognizing both the insight to be gained and their limitations. For example, mathematically proficient high school students analyze graphs of functions and solutions generated using a graphing calculator. They detect possible errors by strategically using estimation and other mathematical knowledge. When making mathematical models, they know that technology can enable them to visualize the results of varying assumptions, explore consequences, and compare predictions with data. Mathematically proficient students at various grade levels are able to identify relevant external mathematical resources, such as digital content located on a website, and use them to pose or solve problems. They are able to use technological tools to explore and deepen their understanding of concepts. 7 Look for and make use of structure. Mathematically proficient students look closely to discern a pattern or structure. Young students, for example, might notice that three and seven more is the same amount as seven and three more, or they may sort a collection of shapes according to how many sides the shapes have. Later, students will see 7 8 equals the well remembered , in preparation for learning about the distributive property. In the expression x 2 + 9x + 14, older students can see the 14 as 2 7 and the 9 as They recognize the significance of an existing line in a geometric figure and can use the strategy of drawing an auxiliary line for solving problems. They also can step back for an overview and shift perspective. They can see complicated things, such as some algebraic expressions, as single objects or as being composed of several objects. For example, they can see 5 3(x y) 2 as 5 minus a positive number times a square and use that to realize that its value cannot be more than 5 for any real numbers x and y. 47
12 Grade 6 Mathematics, Quarter 4, Unit 4.3 Statistical Variability and Graphing (10 days) Clarifying the Standards Prior Learning Having worked with measurement data in previous grades, students began to develop notions of statistical variability, summarizing, and describing distributions. (PARCC Frameworks, p. 27) In grades 3 5, students made line plots to display data. Current Learning Students recognize a statistical question. They use the data that is collected to answer a statistical question. Students recognize that a measure of center summarizes all values within a given set, while a measure of variation describes how its measures vary with a single number. They understand the distribution of data in a set of numerical data. Students display numerical data in dotplots, number lines, histograms, and boxplots. According to the CCSS, this is a critical area. According to PARCC, this is an additional cluster. Future Learning In grade 7, students will use random sampling to produce, represent, and support valid inferences. They will also use data from random sampling to estimate and predict. In addition, students will use graphs of two sets of data to assess variability. Finally, they will compare two sets of data to draw inferences using measures of center and measures of variability with numerical data. Additional Findings According to PARCC Progressions 6 8 Statistics and Probability, Statistical investigations begin with a question, and students now see that answers to such questions always involve variability in the data collected to answer them. Variability may seem large, but it is important to interpret variability in terms of the situation under study, the questions being asked and other aspects of data distribution. (p. 4) According to Principles and Standards for School Mathematics, middle grade students should formulate questions and design experiments or surveys to collect relevant data so that they can compare characteristics within a population or between populations. (p. 249) As data collection is a part of the middle grade science curriculum, math teachers may find it useful to collaborate with science teachers to be consistent in design of experiments. (p. 249) According to PARCC Frameworks, statistical variability and summarizing and developing distributions are an additional cluster. (p. 30) 48
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