{"id":1731,"date":"2020-07-07T14:01:37","date_gmt":"2020-07-07T21:01:37","guid":{"rendered":"https:\/\/mathtalk.sdsu.edu\/wordpress\/?page_id=1731"},"modified":"2020-08-04T13:58:52","modified_gmt":"2020-08-04T20:58:52","slug":"proportions-lesson-4-teachers","status":"publish","type":"page","link":"https:\/\/mathtalk.sdsu.edu\/wordpress\/mathtalk-for-teachers\/proportional-reasoning-unit-teachers\/proportions-lesson-4-teachers\/","title":{"rendered":"Proportions Lesson 4 (Teachers)"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\">Using Diagrams to Iterate Ratios<\/h3>\n\n\n\n<p>Kate and Christopher discover a way to solve proportional reasoning problems in a speed context, by drawing diagrams and repeating (iterating) a ratio of distance and time.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><a href=\"https:\/\/mathtalk.sdsu.edu\/wordpress\/mathtalk-for-teachers\/proportional-reasoning-unit-teachers\/proportions-lesson-4-teachers\/proportions-lesson-4-episode-1-teachers\/\">Episode 1: Making Sense<\/a><\/h5>\n\n\n\n<p>Kate and Christopher use the Races applet to find the number of miles and minutes the red car should travel to go at the same speed as the blue car, which travels 12 miles in 9 minutes. They note some patterns that work and others that don\u2019t work.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><a href=\"https:\/\/mathtalk.sdsu.edu\/wordpress\/mathtalk-for-teachers\/proportional-reasoning-unit-teachers\/proportions-lesson-4-teachers\/proportions-lesson-4-episode-2-teachers\/\">Episode 2: Exploring<\/a><\/h5>\n\n\n\n<p>Kate and Christopher use a diagram to find the amount of time it should take a car to travel 60 miles so it goes at the same speed as a car traveling 12 miles in 9 minutes.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><a href=\"https:\/\/mathtalk.sdsu.edu\/wordpress\/mathtalk-for-teachers\/proportional-reasoning-unit-teachers\/proportions-lesson-4-teachers\/proportions-lesson-4-episode-3-teachers\/\">Episode 3: Reflecting<\/a><\/h5>\n\n\n\n<p>Kate and Christopher see four little trips of 12 miles in 9 minutes in a diagram that shows a journey of 48 miles in 36 minutes.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-background has-vivid-cyan-blue-background-color has-vivid-cyan-blue-color\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Mathematics in this Lesson <a href=\"https:\/\/mathtalk.sdsu.edu\/wordpress\/wp-content\/uploads\/proportions-teacher-docs\/proportions-l4-mathematics-in-this-lesson.pdf\" target=\"_blank\" rel=\"noreferrer noopener\"><img loading=\"lazy\" decoding=\"async\" width=\"34\" height=\"34\" class=\"wp-image-2214\" style=\"width: 34px; vertical-align: middle;\" src=\"https:\/\/mathtalk.sdsu.edu\/wordpress\/wp-content\/uploads\/2020\/07\/pdf.jpg\" alt=\"\"><\/a><\/h3>\n\n\n\n<p class=\"has-medium-font-size\">Common Core Math Standards <input type='hidden' bg_collapse_expand='69e1f191cee004066543092' value='69e1f191cee004066543092'><input type='hidden' id='bg-show-more-text-69e1f191cee004066543092' value=' '><input type='hidden' id='bg-show-less-text-69e1f191cee004066543092' value=' '><button id='bg-showmore-action-69e1f191cee004066543092' class='bg-showmore-plg-button bg-blue-button bg-arrow '   style=\" color:white;\"> <\/button><div id='bg-showmore-hidden-69e1f191cee004066543092' ><\/p>\n\n\n\n<p><a href=\"http:\/\/www.corestandards.org\/Math\/Content\/6\/RP\/A\/3\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>CCSS.Math.Content.6.RP.A.3<\/strong><\/a>. <em>Use ratio and rate reasoning to solve real-world and mathematical problems.<\/em><\/p>\n\n\n\n<p>In this lesson, students create a diagram to solve a real-world problem. They find the time it should take a car to travel a certain distance, so that it is goes the same speed as a car traveling 12 miles in 9 minutes. The students iterate a trip of 12 miles in 9 minutes until the diagram shows a journey of 48 miles. The students can then see that a car traveling at the same speed as a car traveling 12 miles in 9 minutes must travel 36 minutes to go 48 miles. The students notice that there are four copies of smaller identical trips that make up a journey of 48 miles in 36 minutes. Each little trip is represented in the diagram by both the miles traveled and the time it took to travel those miles. The diagram reinforces the idea that quantities of time and distance are joined together to form a ratio that represents the speed of the car. <\/div><\/p>\n\n\n\n<p class=\"has-medium-font-size\">Common Core Math Practices <input type='hidden' bg_collapse_expand='69e1f191cef708021589414' value='69e1f191cef708021589414'><input type='hidden' id='bg-show-more-text-69e1f191cef708021589414' value=' '><input type='hidden' id='bg-show-less-text-69e1f191cef708021589414' value=' '><button id='bg-showmore-action-69e1f191cef708021589414' class='bg-showmore-plg-button bg-blue-button bg-arrow '   style=\" color:white;\"> <\/button><div id='bg-showmore-hidden-69e1f191cef708021589414' ><\/p>\n\n\n\n<p><strong><a rel=\"noreferrer noopener\" href=\"http:\/\/www.corestandards.org\/Math\/Practice\/MP6\/\" target=\"_blank\">CCSS.MATH.PRACTICE.MP6<\/a><\/strong>. <em>Attend to precision<\/em>.<\/p>\n\n\n\n<p>According to the Common Core&#8217;s description of Math Practice 6, mathematically proficient students \u201ctry to communicate precisely with others\u201d while they \u201cexamine claims and make explicit use of definitions.\u201d In this lesson, as Kate and Christopher begin to create diagrams to solve more challenging same speed problems, they attend to precision in two ways. First, they attend to the precise meaning of a car going at the same speed as another car <strong>[3:06 in Episode 1]<\/strong>. Christopher\u2019s language becomes more precise when he says, \u201cThey (the two cars) are going at the same speed, but they will arrive at different times.\u201d Second, they attend to the key details in their diagram with precision. When Kate and Christopher redraw their diagram to find the time it should take a car to travel 60 miles so that it goes the same speed as a car traveling 12 miles in 9 minutes, they no longer include images of people or houses. They also alter their diagram so that the size of each representation of a little trip of 12 miles in 9 minutes is about the same size <strong>[3:15 in Episode 2]<\/strong>. <\/div><\/p>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-background\" href=\"https:\/\/mathtalk.sdsu.edu\/wordpress\/\" style=\"background-color:#2d4059\">Home<\/a><\/div>\n\n\n\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-background\" href=\"https:\/\/mathtalk.sdsu.edu\/wordpress\/mathtalk-for-teachers\/\" style=\"background-color:#2d4059\">Teachers Home<\/a><\/div>\n\n\n\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-background\" style=\"background-color:#2d4059\">Proportions<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Using Diagrams to Iterate Ratios Kate and Christopher discover a way to solve proportional reasoning problems in a speed context, by drawing diagrams and repeating (iterating) a ratio of distance and time. Episode 1: Making Sense Kate and Christopher use the Races applet to find the number of miles and minutes the red car should [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":547,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1731","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/mathtalk.sdsu.edu\/wordpress\/wp-json\/wp\/v2\/pages\/1731","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mathtalk.sdsu.edu\/wordpress\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/mathtalk.sdsu.edu\/wordpress\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/mathtalk.sdsu.edu\/wordpress\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/mathtalk.sdsu.edu\/wordpress\/wp-json\/wp\/v2\/comments?post=1731"}],"version-history":[{"count":6,"href":"https:\/\/mathtalk.sdsu.edu\/wordpress\/wp-json\/wp\/v2\/pages\/1731\/revisions"}],"predecessor-version":[{"id":2490,"href":"https:\/\/mathtalk.sdsu.edu\/wordpress\/wp-json\/wp\/v2\/pages\/1731\/revisions\/2490"}],"up":[{"embeddable":true,"href":"https:\/\/mathtalk.sdsu.edu\/wordpress\/wp-json\/wp\/v2\/pages\/547"}],"wp:attachment":[{"href":"https:\/\/mathtalk.sdsu.edu\/wordpress\/wp-json\/wp\/v2\/media?parent=1731"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}