3 Bridges


To begin class, display this image as an Estimation 180 type task. Ask, “How long is the bridge?”
china bridge

Note: I was inspired to create this task when Daily Overview shared the picture above.

Act 1:

Which car will cross its bridge first?

Act 2:

What information would be useful to figure this out?

The Act 1 video already contains key information about the speed. Therefore, I only provided the bridge distances in Act 2. However, there are a couple ways to go about this.

First, I think it would be fun to have the students find the distances themselves by using a Google Maps Engine.

Google Maps Engine

Credit Jennifer Magiera for introducing this at a recent Google session. The students can use the measurement tool to calculate the distance of the bridges. Also, they can outline the bridges with the polygon tool and drag the different bridges to each other to compare sizes. I’d let the kids play around with it to come up with some data before giving the actual distances.

However, for those who have school internet issues, I provided the actual distances.

Brooklyn Bridge Length

Go to the official lesson page for the other bridge dimensions.

Act 3:


What would happen if the car in Virginia was going 50 mph?

What would happen if the Jiaozhou Bay Bridge was 41.58 miles long?

Official Lesson Page:

What did I miss? How can this be improved?

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