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 7 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.

Find the analog clock with minute and second hands removed that was used in Unit 9 Lesson 9.

Gather a collection of coins (pennies, nickels, dimes, and quarters).

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 D from Unit 8 (Teacher Guide)
  Addition Facts I Know chart
  100 Chart (Student Activity Book) Reference
  20 connecting cubes
  collection of coins (pennies, nickels, and dimes)
  number lines
  

• You will also need:
  

  a bag

LESSON	SESSIONS	DESCRIPTION	SUPPLIES
LESSON 1 The Hour and Half Hour	1–2	Students identify the minute hand on an analog clock and use the hour and minute hands to tell and write the time to the nearest half hour.	individual clock analog clock with minute and second hands removed demonstration clock
LESSON 2 100 Links	1	Students work in groups with chain links grouped by tens in alternating colors. They practice counting by tens. Students partition 100 into two parts using the links and write number sentences that describe their partitions.	links number lines
LESSON 3 Pennies and Dimes	1–2	Students divide groups of 10 pennies and 10 dimes into two piles. They write addition and subtraction sentences to represent the number combinations of their coin piles. They complete the lesson by finding the values of collections of pennies and dimes.	pennies dimes display set of coins
LESSON 4 Dimes, Nickels, and Quarters	2	Students review and compare the values of pennies, nickels, dimes, and quarters. They practice finding the value of collections of coins and then determine different combinations of coins that add up to 100 cents.	crayon calculations collection of coins in bags (pennies, nickels, dimes, quarters) display set of coins number lines
LESSON 5 Moving on the 100 Chart	2	Students develop their knowledge of number relationships by playing the Moving on the 100 Chart Game. After each player makes a move one more, one less, ten more, or ten less on the chart, he or she writes a number sentence to describe the move. The player who gets closest to 100 wins the game.	spinners or paper clips and pencils counters or game tokens number lines connecting cubes
LESSON 6 Could Be or Crazy	1	Students use their growing understanding of numbers to 100 to make estimates and measurements in nonstandard units (links) and standard units (inches). They evaluate the reasonableness of their estimates and learn to recognize that the measure of a length is dependent on the size of the unit of measure.	links number lines chart paper
LESSON 7 Adding and Subtracting Multiples of Ten	2	For many students, counting by tens, adding tens, and subtracting tens are an extension of corresponding work with ones. Similarly, there is a connection between counting on or back by ones and counting on or back by tens. In this activity, students use their knowledge of addition and subtraction with ones to solve problems involving multiples of ten.	connecting cubes number lines
LESSON 8 Use Math Strategies to Solve Problems	1	Students solve addition and subtraction problems while focusing on the important information in the problem, finding a strategy, showing their work, and checking for reasonableness. They encounter a range of different kinds of addition and subtraction problems including multi-step problems.	connecting cubes number lines