Presentation on theme: "Implementing the 6th Grade Mathematics GPS via Centimeter Cubes"— Presentation transcript:
1Implementing the 6th Grade Mathematics GPS via Centimeter Cubes Presented by Judy O’Neal
2Topics Addressed Views of solid figures (polyhedra) Volumes of right rectangular prisms (polyhedra)Surface area of right rectangular prisms (polyhedra)Proportional relationships (scale factors)Connections among mathematical topics
3A View from the Top 1Use the numbers on the mat and your centimeter cubes to construct the building whose top (footprint) view is shown below.
4A View from the Top 2Which of the architectural views below represent the front, back, left, and right of your building?
5Architectural Plans 3A QUESTIONS FOR STUDENTS: 131Front Front Left Right BackQUESTIONS FOR STUDENTS:What is the relationship between the front and back views?What is the relationship between the left and right views?3121
6A View from the Top 3Use your cubes to construct the building represented by the following mats.A. B C.FRONT FRONTFRONTOn centimeter grid paper (downloadable), draw the architectural plans for each building and label the front, back, left, and right view for each.13142132323432121411
7Architectural Plans 3B QUESTIONS FOR STUDENTS: 421234Front Front Left Right BackQUESTIONS FOR STUDENTS:What is the relationship between the front and back views?What is the relationship between the left and right views?
8Architectural Plans 3C QUESTIONS FOR STUDENTS: 243211Front Front Left Right BackQUESTIONS FOR STUDENTS:What is the relationship between the front and back views?What is the relationship between the left and right views?
9A View from the Top 4Use the plans below to construct a building. Record the height of each section of the building on the mat.Top Front Right MAT
10Keep this model intact for use later in this webcast. A View from the Top 5Use the plans below and centimeter cubes to construct a building. Record the height of each section of the building on the mat.Top Front Right MATKeep this model intact for use later in this webcast.
11Isometric Views from a Footprint/Mat Which isometric drawing shows the view from the left front corner of the building represented by the footprint below?* Excerpt from student worksheet (downloadable) “Isometric Explorations”, pp (Navigating through Geometry in Grades 6-8, NCTM, 2002)
12Sketching an Isometric Drawing Isometric dot paper has dots placed so that isosceles triangles can be drawn easily.Sketching a cubeis much like drawing a pattern block yellow hexagon with three blue rhombi on top.
13Isometric Drawings Practice Using isometric dot paper (downloadable), sketch each of these structures.
14Volume of Building 5 Top Front Right MAT How many cubes are there in each layer of the solid (saved from earlier in the webcast)?What is the total number of cubes in this building (volume)?
15Volume of a Rectangular Solid Use centimeter cubes to construct solids made up of the following stack of cubes.How many cubes are there in each layer of the solid?____ ____ ____ ____ ____What is the volume of this solid (total number of cubes)? ____ cm3431215122
16What is a polyhedron?A polyhedron is a three-dimensional solid whose faces are polygons joined at their edges (no curved edges or surfaces).The word polyhedron is derived from the Greek poly (many) and the Indo-European hedron (seat).
17Regular PolyhedronA polyhedron is said to be regular if its faces are made up of regular polygons (sides of equal length placed symmetrically around a common center).Octahedron – 8 Triangular FacesCube – 6 Square FacesDodecahedron-12 Pentagonal Faces
18Irregular PolyhedraFaces are a combination of different polygons.
19Non-Polyhedra Cylinder Cone Sphere Why aren’t each of these solids a polyhedron?
20Polyhedra in our World Crystals are real-world examples of polyhedra. The salt you sprinkle on your food is a crystal in the shape of a cube.
21What is a Prism?A prism is a polyhedron (three-dimensional solid) with two congruent, parallel bases that are polygons, and all remaining (lateral) faces are parallelograms.
22What is a Right Prism?A right prism is a prism in which the top and bottom polygons lie on top of (parallel to) each other so that the vertical polygons connecting their sides are perpendicular to the top and bottom and are not only parallelograms, but rectangles.A prism that is not a right prism is known as an oblique prism.
23What is a Right Rectangular Prism? A right rectangular prism is a right prism in which the upper and lower bases are rectangles.A rectangular prism has six rectangular faces.How many edges?
24What is a Cube?A cube is a right rectangular prism with square upper and lower bases and square vertical faces.How many faces? edges?
25Cubes in our WorldThe world's largest cube is the Atomium, a structure built for the 1958 Brussels World's Fair. The Atomium is feet high, and the nine spheres at the vertices and center have diameters of 59.0 feet. The distance between the spheres along the edge of the cube is 95.1 feet, and the diameter of the tubes connecting the spheres is 9.8 feet.
26Caroline the CubeOn Caroline’s first birthday, she looks like one centimeter cube.Help Caroline finish building herself on her 2nd birthday.(Hint: Build a cube whose length, width, and height are 2 cm.)How many blocks define Caroline on her 2nd birthday? (What is her volume?)
27Caroline’s Surface Area The area of the exposed surfaces of a solid object is its surface area.What is Caroline’s surface area on her 1st birthday?On her 2nd birthday?On her 3rd birthday?On her 5th birthday?On her nth birthday?
28Volume of a Cube Consider the 3-cube and the 5-cube on the left. How long is the front bottom edge?right bottom edge?What is the area of the base (number of cubes in the bottom layer)?Recall the area of a square is (side length)2How many layers are there (height)?How many total cubes (volume)?Volume is area of the base * height.Since all dimensions of a cube are equal, the volume of a cube is (side length)3 orV=s3.
29Surface Area of a CubeSuppose the length, width, and height of the given cube is 2 cm. What is the surface area?What happens to the surface area of a cube when all of the dimensions are tripled?What happens to the edge length of a cube when the surface area is doubled?What can be said about the number of edges in each of these cubes?
30Building Right Rectangular Prisms Using 12 centimeter cubes, build all possible rectangular prisms.Which model has the largest surface area for the given volume of 12 cubic centimeters (cm3)?Excerpt from Student Activity Sheets (downloadable) “To the Surface and Beyond”, pp , Navigating through Measurement in Grades 6-8, NCTM, 2002.
31Volume of Right Rectangular Prism Using centimeter cubes, build a right rectangular prism with front edge length of 3 cubes, right edge width of 2 cubes, and height of 2 cubes.How many cubes are contained in the prism?What is the area of the base (front edge length * right edge width)?What is the height?What is(front edge length) * (right edge width)*(height)?How does this compare to the total number of cubes in the prism?In general, the volume of a right rectangular prism isV = length * width * height or V = lwh.
32Scale Factor, Volume, and Surface Area of a Rectangular Prism Excerpt from Student Activity Sheet (downloadable) p from Navigating through Measurements in Grades 6-8, NCTM, 2002.Two rectangular prisms have similar shapes. The front and back faces are the same shape, the top and bottom faces are the same shape, and the two remaining faces are the same shape.What is the scale factor (ratio)of the edges of the prisms?What is the scale factor of thesurface areas of the prisms?How does the scale factor of the two volumes compare with thescale factor of the edges?
33GPS AddressedM6M2Select and use units of appropriate size and type to measure volumeM6M3Determine the formula for finding the volume of fundamental solid figuresCompute the volumes of fundamental solid figures, using appropriate units of measureEstimate the volumes of simple geometric solidsM6M4Find the surface area of right rectangular prisms using manipulativesCompute the surface area of right rectangular prisms using formulaeM6A2Describe proportional relationships mathematically using y = kx, where k is the constant of proportionalityM6G2Interpret and sketch front, back, top, bottom, and side views of solid figuresM6P4Understand how mathematical ideas interconnect and build on one another to produce a coherent whole
34Websites for Additional Exploration Learning about Length, Perimeter, Area, and Volume of Similar Objects Using Interactive Figures: Side Length and Area of Similar FiguresInterMathLinking Length, Perimeter, Area, and VolumeEric Weisstein’s World of Mathematics