Read the Discuss section of the Newswire pages in the Student Guide with students. Discuss the division of the place value chart into periods.
- Describe the pattern in the Place Value Chart. (Hundreds, tens, and ones repeat in each period.)
- How does the pattern within each period help make reading and writing numbers easier? (Students might say that knowing this pattern—hundreds, tens, ones—helps them to say the number within each period. Or, it is just like reading smaller numbers and then adding the name of the period to what you say.)
- We usually divide periods with a comma or a space when we write numbers. How do the commas help make numbers easier to read? (Students might say that it helps them to see the groups of three and how many groups of three there are. This idea will be further developed in Lesson 4 of this unit as students find that each place to the left is a larger power of ten.)
Questions 1–3 in the Student Guide provide more practice in reading, writing, and ordering large numbers using the National Parks as a context. Have students use the remaining rows on their Place Value Charts to list the number of acres for each of the National Parks in order from smallest to largest.
Remind students to use the Writing Numbers in Words page of the Reference section of their Student Guide to help them write large numbers in words.
Acres. The questions in the Student Guide involve the areas of some national parks. These areas are given in acres. An acre is a measure of land equal to 43,560 square feet. There are 640 acres in a square mile. Students may be unfamiliar with this measurement. Help them visualize it by telling them that the playing area of a football field is a little larger than an acre.
Assign the Homework section in the Student Guide to provide practice and an opportunity to assess students' abilities to read, write, compare, order, and represent large numbers.
Use the Newswire Homework section in the Student Guide to assess student's progress on the following expectations:
- E1.
- Read and write large numbers (to the millions).
- E2.
- Compare and order large numbers (to the millions).
- E3.
- Represent large numbers (to the millions) using place value charts, number lines, and number sentences (e.g., 10,705 = 10,000 ÷ 700 + 5).
Targeted practice for these expectations is in the Workshop in Lesson 7.
