Find a place to display a large monthly calendar for students to see and write on. As daily routine, students will record their thinking on this calendar as they explore patterns in factors and multiples. See Unit 3 Lesson 5.

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

Attach a desk number line (0–100) to each student's desk to use throughout the year.

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

Gather three different brands of paper towels. Each brand should vary by absorbency. (See the Lesson 4 Materials Preparation.)

Gather eyedroppers and small containers for water for each small group. (See the Lesson 4 Materials Preparation.)

Gather a geoboard or a stack of books for each small group. (See the Lesson 4 Materials Preparation.)

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

• individual clocks
• number lines
• base-ten pieces
• connecting cubes or counters
• Centimeter Graph Paper
• monthly calendar
• Subtraction Flash Cards: Groups 7 and 8 (stored in an envelope)
• Subtraction Facts I Know charts (from Unit 2)

LESSON	SESSIONS	DESCRIPTION	SUPPLIES
LESSON 1 Time to the Nearest Five Minutes	2–3	This lesson begins with a review of telling time to the nearest five minutes using the hour hand. In the second part of this lesson students explore the relationship of the movement of the hour hand with the movement of the minute hand, telling time to the nearest five minutes. Students solve problems involving elapsed time.	individual clocks
LESSON 2 Measuring Area	1–2	Professor Peabody is covering his living room and hall with square tiles. Students help him determine how many tiles he will need. Students expand their understanding of area by measuring the area of irregular shapes. They count whole square units and piece together the remaining fractional pieces to make whole tiles.	square-inch tiles clear plastic ruler
LESSON 3 Boo the Blob	1	Students find the area of a “blob” named Boo. Boo can change shape but not area. In this context, students investigate the relationship between shape and area and estimate the area of irregular shapes. They also learn to find the median value of data.	square-inch tiles
LESSON 4 Which Picks Up More?	4–5	Students use mathematical models (e.g., graphs, tables, and diagrams) to decide which paper towel brand picks up more water or is the better “picker upper.” Students measure the area of a spot made by a given number of drops of water on different brands of paper towels. Then, they use a paper model to estimate the number of drops that a paper towel might pick up.	eyedroppers paper towels scissors containers for water books or geoboards copy paper
LESSON 5 The Haunted House	1	Rosita and Peter solve a mystery about a haunted house by finding the length and area of a ghost's footprint.
LESSON 6 Joe the Goldfish	1	Students work in pairs or groups to determine the amount of material it would take to make a raincoat for Joe the Goldfish. They must first design the coat and then determine its area in square centimeters.	scissors
LESSON 7 Using Number Sense at the Book Sale	1	Students solve word problems involving purchasing books at a book sale. They estimate to find which items they can buy for a given amount of money.	desk number line (0–100)