Count Pixels in a Grid
Multiply the number of rows by the number of columns to count pixel positions.
About 18 minutes, plus any extended practice
Open lesson 1Encode Pictures and Written Messages
Represent a 2×3 picture with paletteA=dark,B=light and row sequencesABA/BAB. Count pixels and estimate its data at 2 bytes per pixel; state the model’s limit.
Before you begin
- Multiply whole numbers and follow a key.
Choose by skill rather than age alone. Read with an adult when useful, revisit a lesson, or explore another grade.
Follow the lesson sequence
Use a Palette to Decode a Picture
Use the supplied palette and preserve the order of the symbols.
About 18 minutes, plus any extended practice
Open lesson 2Translate Text with an Agreed Character Code
Look up each supplied code value and join the characters in the recorded order.
About 18 minutes, plus any extended practice
Open lesson 3Estimate an Uncompressed Representation
Multiply recorded element count by the stated bytes per element, using consistent units.
About 18 minutes, plus any extended practice
Open lesson 4Review and transfer
After the lessons, try 4 new review cases and a practical task. Each answer has an explanation and a link back to the related lesson.
Open the unit reviewGuest answers are temporary. Keep your own paper or document; this unit does not certify completion or record a school grade.
Topic references
- 2026 CSTA PK–12 Computer Science Standards: topic reference — Data & Analysis
These references informed the topic selection. They do not certify complete standards alignment.