Lesson plan

Solving problems of elapsed time by using a number line

teaches Common Core State Standards CCSS.Math.Content.3.MD.A.1 http://corestandards.org/Math/Content/3/MD/A/1
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4

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Big Ideas: Time can be measured. Time is the duration of an event from its beginning to its end. Problems involving time can be solved using a number line diagram. This lesson builds on students’ work with telling and writing time to the nearest 5 minutes. The task uses a number line diagram (or clock number line) to calculate a beginning time, an end time, or the amount of time that has elapsed, if the other two elements are given. Students will use their understanding that the numerals and marks on a number line represent specific increments, like those on a clock. The mathematics concept in this lesson builds students’ proficiency with solving word problems involving elapsed time. Vocabulary: elapsed time, beginning time, end time, minutes, seconds, hours