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