# Numbers on screen don't match the source

Prompts to start with when a codebase shows this problem.

- [Missing vs zero vs stale](https://atlasscope.dev/prompts/missing-vs-zero-vs-stale): Finds where 'we don't know' turns into 0 and then into a wrong total.
- [Where did this number come from?](https://atlasscope.dev/prompts/where-did-this-number-come-from): Checks that every number on screen can be traced back to a source document.
- [Two systems that disagree](https://atlasscope.dev/prompts/two-systems-that-disagree): Finds data kept in two places (a saved copy and a table, the browser and the server) that can quietly disagree.
- [Rounding and unit mix-ups](https://atlasscope.dev/prompts/rounding-and-unit-mix-ups): Finds money and percentage values that change scale or lose precision along the way.
- [Can we independently prove these numbers?](https://atlasscope.dev/prompts/can-we-independently-prove-these-numbers): Important figures may be wrong even though their lineage is documented.

Source: https://atlasscope.dev/fix/numbers-on-screen-dont-match-the-source