## Teacher Guide: Lesson 21.3

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 “Scientists Question Home-Run Sluggers” discusses recent findings on the manufacture of baseballs. Students learn that balls made in recent years are made with materials that give them greater loft than balls made in the past. Have the students read the article. Allow a brief discussion about contemporary baseball players who have made many home runs. Tell students to consider whether or not these same players would have had as much success if they were playing with the old kind of baseballs.

The Word Wise activity challenges students to complete sentence starters that contain the word “evident.” Here are some possible responses for each:

1. Since you got 100% on your test, it is evident that you studied hard/the test was easy
2. From the way your mom smiles at you, it is evident that she loves you/you make her happy
3. When you didn't finish your dinner, it was evident that you weren't very hungry/you didn't like the meal

The Data Hunt activity is intended to give students experience in writing the word form of decimal amounts greater than 1. The bar graph shows attendance data at spectator sports for one recent year in decimal amounts. For example, the number of people at major league baseball games is shown as 68.5M. Students write only the decimal amount in words followed by the letter M; for example, “sixty-eight and five tenths M.” You may wish to remind students that this actual amount is “sixty-eight and five tenths million,” or “sixty-eight and a half million,” which can be written as 68,500,000.