Classroom Bell Ringer Generator — illustrative example

INPUT
Create a short bell ringer before introducing rectangle area. Use a grid of three rows and four columns of equal squares.

RESULT
Count the equal squares in this rectangle:
□ □ □ □
□ □ □ □
□ □ □ □
How could grouping the rows help you count without counting every square separately?
Teacher check: 12 squares; three groups of four, or 3 × 4.

REVIEW
A bell ringer should activate relevant prior knowledge without consuming the lesson. Make the task and expected response immediately clear.

This is a teaching example, not a live execution record.