Lesson Plan:

# Thermometer Subtraction: Number Line Adventures

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Subject
Standards
August 7, 2015

## Learning Objectives

Students will be able to subtract two digit numbers from each other. Students will be able to identify hot and cold temperatures.

## Lesson

### Introduction (5 minutes)

• Tell your students that they will be practicing subtraction using a thermometer (a device that measures temperature) number line.

### Explicit Instruction/Teacher Modeling (5 minutes)

• Ask your students if they are familiar with thermometers. Potential discussion questions include: Where have you seen a thermometer? What does it do? Why do you think the red line on the thermometer moves?
• Make sure that your students know that when the temperature is hot, the red line on the thermometer goes up. When it gets cooler, the red line goes down.

### Guided Practice/Interactive Modeling (10 minutes)

• Hand out the Thermometer Subtraction worksheet.
• Go over the worksheet together as a class.
• Direct your students to color in the high temperature on each of the three problems with a red crayon or colored pencil.
• Have your students write number sentences to go with each of the three thermometer math problems.
• Ask your students to write down the correct temperature to the subtraction problem.
• When your students are finished, pass out the Hot or Cold? worksheet for students to complete on their own.

### Independent Working Time (5 minutes)

• Have your students complete the Hot or Cold? worksheet on their own.
• Direct them to determine what kind of temperature goes with each picture.
• Refer to personal experiences of wearing lots of clothes in cold weather to illustrate temperature.

## Extend

### Differentiation

• Enrichment: Have your students create their own thermometers on paper, and instruct them to label the lines of temperature. They may use their thermometers as number lines for future math activities.
• Support: Pair your students up during the independent worksheet time. Have one student identify the numbers on the thermometer, and have the other subtract.

## Review

### Assessment (5 minutes)

• As your students are working on the two worksheets, walk around and make sure that they are completing them accurately.

### Review and Closing (5 minutes)

• Go over the Hot or Cold? worksheet together to make sure your students understand the concept of temperature.
• Ask them to come up with other hot and cold situations.