## Lesson: Estimating and Measuring Amounts

Developing the Concept

In this lesson, students use standard units to measure length to the half inch.

**Materials:** one inch-ruler (Learning Tool 24 in the *Learning Tools Folder*), and one copy of Worksheet A (PDF file) for each pair of students

**Preparation:** Distribute the rulers or have students cut out the ruler from Learning Tool 24, which shows a one-inch ruler and a centimeter ruler.

**Prerequisite Skills and Concepts:** Students should know how to measure to the nearest inch.

**Wrap-Up and Assessment Hints**

As students are working, remind them to line up the ruler carefully with the end of the object they are measuring. Provide students with sufficient practice reading the marks on a ruler. Assess students' ability to measure by observing them as they measure objects.