## Teacher Guide: Lesson 2.3

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 “The Sky's the Limit” discusses the Wright Brothers' first flight and relates information about how its centennial was commemorated. Students also get a brief look at the history of aviation from 1903 to the present.

The Word Wise activity informs students that some English words have Latin derivations. Students will find out that the Latin word avis means “bird” and that in Latin, memorare means “to remember.” Have students find the definitions of the words listed below in a dictionary, then write the definitions and the Latin root for each word. You may discuss with students the meaning of each root and how it informs the definition of each word.

aviary:
A large enclosure that holds birds. (The Latin root is avis, which means “bird.”)

terrarium:
A container in which plants and animals are held. (The Latin root is terra, which means “earth.”)

terrace:
An outdoor platform or porch. (The Latin root is terra, which means “earth.”)

memorandum:
A note written as a reminder. (The Latin root is memorare, which means “to remember.”)

The chart in the Data Hunt activity compares the cruising speeds and the average New York-to-London flight times for the now grounded Concorde with that of the Boeing 747. Students interpret the chart and then use subtraction to answer the following questions.

How much faster was the Concorde's cruising speed than the Boeing 747's:

1. in miles per hour?   (760 mi/h faster)
2. in kilometers per hour?   (1,225 km/h faster)
3. How much less time did it take the Concorde than the Boeing 747 to make the New York-to-London flight?   (4 h 25 min less)