Introduction/Posing Problem 
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)


Solving Problem 1 
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)


Sharing/Proportional Relationships 
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)


Sharing/Change Unit of Time 
Students describe their solutions by first expressing 1hr 30mins in hours using decimals or fractions. (3:26) 

Sharing/Find Speed 
The teacher asks a student who solved the problem by finding the speed of the typhoon. (4:05)


Sharing/Add 1on Number Line 
A student who found the unit rate on the double number line expresses her idea. (4:52)


Formulation/Application Problem 
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)


Solving Problem 2 
Students work independently on the problem. (2:28) 

Sharing/Using Formula 
The teacher presents a solution by a student who used the formula derived earlier. (3:19) 

Sharing/Summary 
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)

