# The Smaller They Come

• Math
• 65 minutes
• Standards: 2.MD.A.1
• 5.0 based on 2 ratings
March 21, 2016

Help your students use rulers in the classroom with this lesson! Encourage them to measure items around them using centimeters to understand shapes and sizes.

### Learning Objectives

Students will be able to use standard measures of length and measure using a ruler.

## Lesson

### Explicit Instruction/Teacher Modeling (15 minutes)

• Give your students rulers, and ask them to see what units of length they see.
• Review how to measure an object with a ruler by starting at the 0 mark and measuring straight across.
• Acknowledge that some objects aren't exact, so decimals or fractions are necessary to record an exact measurement.
• Demonstrate on the whiteboard how to measure 3.4 centimeters. Draw several lines for practice.

### Guided Practice/Interactive Modeling (15 minutes)

• Demonstrate to students that 3.4 centimeters can also be written as 34 millimeters.
• Instruct your students to measure lines of different sizes and write them the two ways that they just learned.

### Independent Working Time (15 minutes)

• Give your students the Length in Centimeters worksheet to complete.

## Extend

### Differentiation

• Enrichment: Have your students complete the Measuring Length in Centimeters worksheet.
• Support: Before working on decimals, have your students master the concept of measuring to a whole number. Throughout this activity, have them round up or down to the nearest whole number instead of using decimals or fractions.

## Review

### Assessment (5 minutes)

• Circulate and provide support where needed.
• Make sure that your students are using their rulers from the correct side.

### Review and Closing (5 minutes)

• Ask your students to practice estimating the length of pencils in the classrooms.
• Test the guesses by pulling out your ruler and checking!