Display the class number line (0–130) where students can see and reach it with a pointer.

Attach a desk number line (0–40) to each student's desk to use throughout the year.

Display the Math Practices page where all students can see it.

Attach copies of the Desk-Size 100 Chart to students' desks or folders to use throughout the year in class and at home. See the Unit 9 Lesson 3 Materials Preparation.

Copy the Ten Frames and Number Line Master and the 100 Chart Master back-to-back for easy access to these tools during class and at home. See the Unit 9 Lesson 3 Materials Preparation.

Display the Comparison Symbol Chart from Unit 8 Lesson 5.

Gather a 2-lb. container of beans and a small scoop or small bags. See Lesson 2 Materials Preparation.

Gather and organize 6 to 8 collections of 40 to 70 objects to place in stations. See Lesson 2 Materials Preparation.

Gather headlines from periodicals that have numbers in the headlines. See Lesson 7 Materials Preparation.

Gather 2 two-ounce cups for each student pair.

Gather a 2-pound bag of small beans (e.g., kidney) and a 2-pound bag of large beans (e.g., lima). Place each type of bean in a large container.

Have the following tools readily available for the Daily Practice and Problems items in this unit:

• You and your students will need:
  

  Addition Flash Cards: Group C from Unit 7 (Teacher Guide)

  100 Chart (Student Activity Book) Reference

  20 connecting cubes

  25-link chain of connecting links

  number lines

  12-inch ruler

LESSON	SESSIONS	DESCRIPTION	SUPPLIES
LESSON 1 The Teens	1–2	Students explore the numbers from 11 to 20 and their relationships with ten. Students then discuss the patterns in the naming of these numbers.	connecting cubes chart paper number lines
LESSON 2 Spill the Beans	2	Students group and count a quantity of beans by tens and ones left over, reinforcing the idea that grouping objects before counting is more efficient and accurate than counting by ones. Groupings are referred to as "tens" and "ones" rather than "tens and leftovers."	Comparison Symbol Chart from Unit 8 Lesson 5 beans small scoop or small bag 6 to 8 collections of 40 to 70 objects blank paper number lines
LESSON 3 10 Tens	1–2	Students focus on grouping quantities by ten and counting the leftovers. To work with a large number, students predict the total number of letters in the first names of all students in the class then use connecting cubes to compare the total to 100. Students then recognize that 100 is 10 groups of ten.	connecting cubes calculators number lines
LESSON 4 Spin for 50	1–2	Students practice counting objects using tens and ones. They play Spin for 50 in pairs. Players take turns spinning a spinner to determine the number of Xs to add to a set of five ten frames. The goal is to be the first to fill the ten frames with 50 Xs.	clear plastic spinners or paper clip with pencil number lines
LESSON 5 The 100 Chart	1–2	This lesson builds number sense with the aid of the 100 Chart by focusing on number patterns, number relationships, and the connection between tens and ones. To explore number relationships on the chart, students find target numbers and solve number riddles using more than, less than, between, and closer to.	connecting cubes number lines
LESSON 6 Comparing Lengths	2	Students continue to explore two-digit numbers by placing numbers into intervals and comparing numbers using less than or greater than. Students measure objects using links, record the lengths in tens and ones, and place their link chains into intervals of 10. Students develop number sense as they visually check the placement of the links in intervals and play a number guessing game.	index cards connecting links tape scissors number lines chart paper self-adhesive notes
LESSON 7 Numbers in the News	1–2	Students explore the relative size among numbers. Using two-digit numbers in newspaper headlines, students describe the relationship of one number to others.	Comparison Symbol Chart from Unit 8 lesson 5 12-inch × 18-inch construction paper chart paper headlines from periodicals scissors glue or tape number lines
LESSON 8 Full of Beans	3	Students build ideas about volume and compare relative sizes of units by measuring containers with beans. Students group and count beans by tens and ones and then pool their data to graph the middle, or median, number of beans to compare the quantities.	small beans (kidney) large beans (large lima) 2-ounce cups large containers self-adhesive notes number lines