## Units Three and Four

## Unit 3: Linear Measures and Area

The first three lessons of Unit 3 have students define units of measure by pacing off distances, creating a common unit for the class based on averages and then using US customary and metric units to measure lengths. The remainin lessons of Unit 3 extend work on perimeter and area begun in previous grades. They also begin exploring the value of pi by exploring the relationship between diameter and circumference. Unit 3 has four main areas of focus:

~explore the need for standard units of measure

~measure lengths using customary and metric units

~develop the concept of area

~investigate the relationship between diameter and circumference

~explore the need for standard units of measure

~measure lengths using customary and metric units

~develop the concept of area

~investigate the relationship between diameter and circumference

## Unit 4

## 3.1 "A Class Shoe" Unit of LengthDiscuss the need for standard units of measure and to guide children as they create a unit of length (class shoe) and measure with it.
## 3.2 Measuring with a RulerChildren measure line segments to the nearest inch, half-inch, quarter-inch, centimeter, half-centifmeter and millimeter.
## 3.3 Standard Linear Measures## 3.4 Perimenter## 3.5 Pattern Block Toss Experiment## 3.6 Exploring Perimeter and Area## 3.7 Area## 3.8 Number Models for Area## 3.9 Diameter and Circumference## 3.10 Progress Check 3 |