## Teacher Guide: Lesson 18.6

The Weekly Reader Connections feature on Kids' Place Houghton Mifflin Math provides your students with additional information about the topics that appear in the Curriculum Connection feature in their student books.

The article “Supertrain” describes Amtrak's high-speed Acela train service along the “Northeast corridor.” This means that it travels from Boston through New York to Washington, D.C., making many stops along the way. In addition to the locomotives at both front and rear, the Acela has four coach cars, a first-class car, and a café car located in the middle of the train.

For the Word Wise activity, students are told that the words “acceleration” and “excellence” are the words from which the name “Acela” was derived. Then students are asked to imagine a new form of transportation. Students choose two words and combine them to form a name for this new transportation method.

For the Data Hunt activity, students refer to a table of model plane sizes. They use their knowledge of ratios and scale to find the lengths and wingspans of the actual planes by answering the following questions.

1. What is the length of an actual A320 Northwest plane in inches? in feet?
1,475 in.; 123 ft
2. What is the length of an actual Lockheed P-38J Lightning in inches? in feet?
444 in.; 37 ft
3. What is the length of an actual P47D Thunderbolt in inches? in feet?
448 in.; 37 ft
4. What is the wingspan of an actual B707 American Airlines plane in inches? in feet?
1,750 in.; 146 ft
5. What is the wingspan of an actual B727-200 TWA (OC) plane in inches? in feet?
1,300 in.; 108 ft
6. What is the wingspan of an actual Douglas C-47A Skytrain in inches? in feet?
1,152 in., 96 ft