Home  ## This webpage facilitate opportunities for researchers, administrators, and practicing school professionals throughout the region to exchange ideas for mathematics teachers professionalization using Lesson Study. ## Speed 3

Title Speed 3  1 Takeo Takahashi 2013.09.05 Koganei Elementary School attached to Tokyo Gakugei University Takeo Takahashi Elementary School G-6（12 years old） In this lesson, students solve problems about finding distance from speed and time, and also finding time from speed and distance. "The typhoon moves from Naha to Yoron island for 1 hour 30 mins. Where is this typhoon going to be after 9 hours?" is the main problem to solve. After students work on the problem, the teacher picks up the students' ideas about using a double number line and also finding speed per hour. After that, they derive the formulation "speed x time = distance". Then the teacher poses the problem "How long does this typhoon take to move from Naha to Tokyo, 1600km away?" Students work to find time from speed and distance. (46:53) You need Facebook account to show rating and accept"Join Rating IMPULS". 0% （0 people /0people voted "like it"）
Introduction/Posing Problem Solving Problem 1 The teacher places a map of Okinawa area and shares with the students that it is about 120 km from Naha city to Yoron island. Then he posed the following problem. "The typhoon moves from Naha to Yoron island for 1hour 30 mins. Where is this typhoon going to be after 9 hours?" (4:18) The teacher gives time for students to work individually. Students ask several questions about the problem, so the teacher clarifies the problem for the class, then has them resume work. (4:30) After the students spend about 7 minutes of individual work, the teacher asks students to share what they have done. He asks one student who solved the problem by using number lines and the proportional relationship between distance and time, with the time expressed in minutes. (3:35) Students describe their solutions by first expressing 1hr 30mins in hours using decimals or fractions. (3:26) The teacher asks a student who solved the problem by finding the speed of the typhoon. (4:05) A student who found the unit rate on the double number line expresses her idea. (4:52) Teacher reviews the ideas so far, and derive the formula, "Speed(per hour) x Hours = Distance". After that, he poses the following problem: "How long does this typhoon take to move from Naha to Tokyo, which is 1600km?" (3:52) Students work independently on the problem. (2:28) The teacher presents a solution by a student who used the formula derived earlier. (3:19) The student who solved the problem by using the double number line that appeared in the first problem expresses her solution. Lastly, the teacher summarized the lesson. (5:27)  ## Lesson Study Library

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