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Big Ideas:
Rates of speed are ratios that compare distance to time.
It is possible to calculate speed, distance, or time when you have the other two variables.
This lesson builds on students' understanding of how to calculate a unit rate given distance and time. In this lesson students will calculate the distance or time given the unit rate along with either the distance or time traveled. In this lesson, students will help a young traveler, Siam, who has accidentally spilled cola on a train timetable. Students are asked to fix the timetable by finding either the distance or the time that the train has traveled with a known rate of speed. This lesson builds toward an understanding of ratios of fractions, measured in like or different units, that students will study in grade 7.
Vocabulary: ratio, rate, unit rate, speed
Special Materials:
Fraction strips (optional)
Unifix cubes (optional)