## Teacher Guide: Lesson 1.7

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.

In the article “Cold-Blooded Murder?” students read about Otzi, the “iceman.” Dated to approximately 5,300 BCE, Otzi is the oldest and best-preserved mummy in the world (The oldest mummy found in Egypt is dated to 3,500 BCE.)

The article begins with a reference to Sherlock Holmes. Some students will be able to identify this character as the detective in Sir Arthur Conan Doyle's mystery novels and short stories. Explain that when Otzi was discovered, a great mystery surrounded his mummified remains.

Otzi was found in 1991 in the Alps of northern Italy. The South Tyrol Museum of Archaeology in Bolzano, Italy was later built to hold his bodily remains along with his belongings — bits of clothing and weapons. Students should understand that scientists study prehistoric remains in order to learn more about the history of the world.

The Word Wise activity, based on the vocabulary words preserve and prehistoric, challenges students to investigate the significance of the prefix “pre-” in each of these words: predict, preorder, preslice, prewash, preapprove.

Before having students do the Data Hunt activity, help them to develop some sense of the huge span of time from 5300 BCE to the present. Begin a time line by drawing a very long chalk line across the board. Mark “5300 BCE” at the far left of the line and “2004 AD” at the far right.

The activity familiarizes students with the events surrounding the demise of the Roman town of Pompeii in 79 AD. After students read the story, add the dates “79 AD” and “1748 AD” to the time line.

Point out that the four dates mentioned in the story appear in the chart as numbers in standard form. Students should write these numbers in four other forms as follows:

Number Expanded Form Expanded Form with Exponents Word Form Short Word Form
5,300 5 ( 1,000 ) + 3 ( 100 ) 5 ( 103 ) + 3 ( 10 2 ) five thousand, three hundred 5 thousand, 3 hundred
20,000 2 ( 10,000 ) 2 ( 104 ) twenty thousand 20 thousand
79 7 ( 10 ) + 9 ( 1 ) 7 ( 101 ) + 9 ( 100 ) seventy-nine 79
1,592 1 ( 1,000 ) + 5 ( 100 ) + 9 ( 10 ) + 2 ( 1 ) 1 ( 103 ) + 5 ( 102 ) + 9 ( 101 ) + 2 ( 100 ) one thousand, five hundred, ninety-two 15 hundred, 92