Prompt Like a Teacher for Big Screen Learning

This week I subbed in a fourth grade classroom. The plans had me teaching Bridges Math Unit 7, Module 1, Session 4: Equivalent Fraction Fill. I’ve taught Bridges before, so I know the routine. This lesson uses paper fraction bars and a spinner for a whole-class game.

Instead of juggling all that under a document camera, I asked Google Gemini to turn the paper game into a full-screen digital activity for the classroom touchscreen. I named it Fraction Fill.

Along with the game rules, here are some of the prompts that made a difference:

1. Design for the big screen → Keep everything on one screen. No scrolling.
2. Take up the whole display → Include a full screen button.
3. Add a Start button → Don’t begin or assign teams automatically. Use a big Start button so I can kick things off when I’m ready.
4. Make turns obvious → Add an arrow above the active team and gray out the other side so everyone can see whose turn it is.
5. Plan for learning moments → If a fraction is incorrect, don’t cover up what the student entered. Let us see and talk about it.
6. Include a celebration → Show a message for the winning team and add a glowing border in their color.
7. Show the board at the end → Keep the final board visible so we can review and discuss.

So much of vibe coding is about anticipating actual classroom use. If you picture the lesson playing out, you’ll write better prompts. For Fraction Fill's second game, teams were already strategizing about which fractions were easier to place.