# Digital Information

## Instructional Strategies

## Unit Summary

In the prior unit, Circuits and Switches, students learned how binary numbers 0 and 1 are represented in electrical states (on/off). In the Digital Information unit, students learn how binary numbers can actually be used to create a language and logic for digital devices.

- Understanding some of the ways computers represent, process, and display letters, numbers, sounds, and images

- Comparing the binary number system to the decimal number system

- Adding binary numbers

- Using binary numbers to represent the alphabet (ASCII)

- Decision-making with AND/OR statements

**Goals and Objectives**

Students will learn:

- How the binary system can be used to represent images

- What a pixel is and how it's used to represent images

- How the two-state (on and off) nature of transistors can be used to represent information

- How to convert decimal numbers to binary numbers and vice versa

- How to add binary numbers

- How to represent letters of the alphabet with the 8-bit ASCII code

**Time to Complete Online Lessons:** about 50 minutes

## Preparation

- Read the background information.
- Review and prepare for supplemental lesson ideas and group activities.
- Organize materials and equipment:

- Student computers with an active Internet connection

- Copies of the student handouts for this unit that you plan to use

- Printouts of the interactive whiteboard images (optional)

## Procedures

- Have students complete the online activities:

Throughout the unit, facilitate the development of new vocabulary introduced in this unit. - Students who are not at the computer can work on supplemental lesson ideas and group activities.
- After students complete the online materials, they can:

- Demonstrate their knowledge of the one-to-one correspondence between binary-counting numbers and decimal-counting numbers by completing the table of values online or in the Binary Numbers Student Handout

- Perform simple addition problems between two binary numbers, and check their answers

- Suggest a list of other items that can be represented by a binary system, such as the possible answers in a yes/no survey, a true/false test, a game of 20 questions, and so forth

- Explain in their own words why ASCII code is used and what it's used for

#### Online Resources

Teachers, view online resources to support and enhance your teaching unit.

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