1 Teaching the Lesson materials - Ellis Family

1 Teaching the LessonmaterialsKey ActivitiesStudents locate and discuss important features of the world globe. They use latitude and longitude to locate places on a globe, a world map, andregional Concepts and Skills Multiply multidigit numbers to determine miles from the equator. [Operations and Computation Goal 4] Locate positions on the global coordinate grid system. [Measurement and Reference Frames Goal 4] Describe parallel and intersecting lines in terms of latitude and longitude . [Geometry Goal 1] Identify Earth as a sphere divided into hemispheres. [Geometry Goal 2]Key Vocabulary sphere North Pole South Pole axis equator prime meridian hemisphere latitude (lines) parallels longitude (lines) meridian barOngoing Assessment:Informing InstructionSee page Learning & PracticematerialsStudents play Over and Up Squaresto practice coordinate grid skills.

2 Students practice and maintain skills through Math Boxes and Study Link Assessment:Recognizing Student AchievementUse journal page 165.[Operations and Computation Goal 4]Differentiation OptionsmaterialsStudents read Sea Clocks:The Story of use latitude and longitude to locate places on a map. Teaching Master (Math Masters,p. 196) Teaching Aid Master (Math Masters, p. 388 or 389) Sea Clocks: The Story of longitude per group: flat world political map; 1 penny; scissorsSeeAdvance PreparationEXTRA PRACTICEENRICHMENT3 Math Journal 1,p. 165 Student Reference Book, p. 257 Study Link Master (Math Masters,p. 195) Game Master (Math Masters,p. 494) colored pencils; 2 dice per partnership2 Math Journal 1,p. 164 Student Reference Book Study Link 6 8 slate globe world map1 ObjectiveTo introduce latitude and longitude ; to providepractice finding the latitude and longitude of places on a globeand a map; and to identify places given the latitude and Assessment Management SystemMath Boxes, Problem 2 See the InformationAdvance PreparationFor the optional Enrichment activity in Part 3, obtain a copy of Sea Clocks: The Story of Longitudeby Louise Bordon (Margaret K.)

3 McElderry Books, 2004). Lesson 6 9449450 Unit 6 Division; Map Reference Frames; Measures of Angles Math Message Follow-UpMake one list of things students already know (or think they know)about the world globe and a second list of questions students wouldlike answered. During the discussion that follows, refer to the listswhen facts are reviewed or questions are students that in this Lesson they will explore the coordinategrid system used to locate points on the world globe. Studying a World Globe(Student Reference Book,pp. 272 and 273)Mention that Earth is close to being a perfect sphere;that is, allpoints on Earth s surface are about the same distance from thecenter of Earth. With the help of the class, locate and discuss someof the important features of the North Poleand South Pole: Demonstrate how Earthrotates as students share observations: Earth rotates about an axis(an imaginary line through itscenter) connecting the two poles.

4 Viewed from above theNorth Pole, Earth rotates counterclockwise. All points on the surface of Earth, except the two poles, moveeast as Earth equator:Point out that the equator is a circle and thatevery point on it is the same distance from each prime meridian:Unlike the equator, the prime meridianis a semicircle (half circle). It connects the poles and passesthrough the Royal Observatory at Greenwich, England nearLondon. It was established when England was the foremostseafaring ACTIVITYWHOLE-CLASS ACTIVITY1 Teaching the LessonGetting StartedMath MessageMake a list of the things that you know about theworld globe. Write down one question that you have about the world Link 6 8 Follow-UpHave students compare Math and Reflexes Write decimals on the board and have volunteers readthem aloud.

5 Suggestions: questions such as: What digit is in the tenths place? What is the value of the digit x? and LongitudeYou sometimes use a world globe or a flat map to locate countries,cities, rivers, and so forth. Reference lines are drawn on globesand maps to make places easier to that go east and west around the Earth are called lines equatoris a special line of latitude. Every pointon the equator is the same distance from the North Pole and theSouth Pole. Lines of latitude are called parallelsbecause eachone is a circle that is parallel to the is measured in symbol for degrees is ( ).Lines north of the equator are labeled N. Lines south of theequator are labeled S. The number of degrees tells how farnorth or south of the equator a place is.

6 The area north of theequator is called the Northern area south of the equator is called the Southern TourExamplesExamplesThe latitude of Cairo, Egypt, is 30 say that Cairo is 30 degrees north of the latitude of Durban, South Africa, is 30 is in the Southern latitude of the North Pole is 90 latitude of the South Pole is 90 poles are the points farthest north and farthest south on (latitude)DurbanNorth Pole90 NSouth Pole90 S15 S30 S45 S60 S15 N30 N45 N60 NEquator 0 CairoNorthernHemisphereSouthernHemispher eLongitudeA second set of lines runs from north to south. These aresemicircles (half-circles) that connect the poles. They are calledlines of longitudeor meridians are not parallelsince they meet at the prime meridianis the special meridian labeled 0.

7 Theprime meridian passes through Greenwich, near London, special meridian falls on, or close to, the InternationalDate meridian is labeled 180 and is exactly oppositethe prime meridian, on the other side of the Reference Book, p. 272 Student hemispheres:Demonstrate how the equator and theprime meridian each partition Earth into half-spheres, orhemispheres. The Northern hemisphere is the half-sphere north of theequator. The Southern hemisphere is the half-sphere southof the equator. The Western hemisphere is the half-sphere west of theprime meridian. The Eastern hemisphere is the half-sphereeast of the prime latitudeand longitude lines:Point out the grid thatcircles the globe. The latitude lines are circles above and below the these circles are parallel to the equator, they areoften called parallels.

8 The longitude lines are semicircles that connect the semicircles of longitude are not parallel, since they meetat the sure to emphasize that longitude is represented by semicirclesand latitude by full circles. Introducing the System for Locating Places on the GlobeSocial Studies LinkEmphasize that all latitude andlongitude readings must have two parts: a number ofdegreesand a directionwith reference to the equator or primemeridian. The only exceptions are 0 latitude and either 0 or180 longitude ; the direction is not included because it is out that degrees are printed on, or near, the latitude andlongitude lines on the globe. But the directions (N, S, E, and W)are not printed on the globe, and students must attach a directionto each latitude and longitude reading they make.

9 Latitudes north of the equator (Northern hemisphere ) arelabeled N or North. Latitudes south of the equator (Southern hemisphere ) arelabeled S or South. Longitudes west of the prime meridian (Western hemisphere )are labeled W or West. Longitudes east of the prime meridian (Eastern hemisphere )are labeled E or demonstrate how to locate a point on the globe in relation to the prime meridian and the equator. On the globe, the degreeseast and west of the prime meridian are shown along the globes have a meridian barthat shows degrees north andsouth of the ACTIVITYL esson 6 9451 Adjusting the ActivityStudents and adults often confusethe words latitude (parallels) and longitude (meridians). Suggest and sketch visuals suchas latitudes are like rungs on a ladder toclimb north or south of the equator, and longitude lines are long half-circle paths tothe poles.

10 AUDITORY KINESTHETIC TACTILE VISUALWhen both latitude and longitude lines are shown on a globe ormap, they form a pattern of crossing lines called a can help you locate places on the globe or map. Any placeon the map can be located by naming its latitude and Your UnderstandingCheck Your UnderstandingUse the grid below to find the approximate latitude and longitude for the cities shownon the map. For example, Denver, Colorado, is about 40 North and 105 your answers on page 347. longitude is measured in degrees. Lines west of the primemeridian are labeled W. Lines east of the prime meridian arelabeled E. The number of degrees tells how far west or east ofthe prime meridian a place is located. The area west of theprime meridian is called the Western areaeast of the prime meridian is called the Eastern TourExamplesExamplesThe longitude of London is 0 becauseLondon lies close to the prime longitude of Durban, South Africa, is 30 is in the Eastern longitude of Gambia (a small country inAfrica) is about 15 W.