Check what a rounded readout can hide
A rounded number can stay still while its source changes, then jump after a smaller change. Before describing either movement, establish what the display actually preserves. This fictional manual exercise uses supplied decimal quantities in an ordinary document. Its result is a display-resolution ledger, not a measurement of Kiguri, a real instrument, or a team's performance.
Declare the rendering rule and available evidence
Use nonnegative invented quantities rounded to the nearest whole unit. Exact half values round upward: 9.5 displays as 10. Keep this rule beside the example rather than assuming that every application rounds the same way. Other conventions would need their own checks, especially at boundaries.
Record whether the underlying values are supplied or whether only the readout is available. In this exercise, both are given. In a real review, an extra decimal cannot be reconstructed from a whole-number display. If the source values or rendering rule are unavailable, mark that gap before discussing how much changed. A visually precise number also does not establish that its source is accurate.
Compare a hidden change with a visible jump
The first invented pair is 9.6 followed by 10.4. Both display as 10 under the declared rule. The underlying increase is 0.8, while the displayed difference is zero. Keep both calculations in the ledger; calling the quantity unchanged would replace evidence about the source with evidence about its presentation.
The second pair is 9.4 followed by 9.6. The display changes from 9 to 10, but the underlying increase is only 0.2. The visible one-unit jump does not mean the source increased by one unit. Across these two examples, the larger underlying change is hidden while the smaller change crosses a display boundary. Neither example explains why the quantity changed.
Identify the range behind one displayed value
Under this specific rule, a displayed 10 is compatible with every underlying value at least 9.5 and less than 10.5. Include the lower boundary and exclude the upper one: 9.5 rounds upward to 10, whereas 10.5 rounds upward to 11.
Two readouts showing 10 therefore do not establish equal inputs. They could represent equal values, or different values within that interval. The interval follows from the stipulated rendering rule, not from uncertainty about instrument error. Do not combine those different questions into an invented accuracy claim. Nor should the interval be narrowed merely because one particular example used 9.6.
Leave a resolution-aware interpretation
For each pair, preserve the supplied source values, rounded outputs, true difference and displayed difference. Add the compatible interval when only one readout is being interpreted. Ask another reader to reconstruct both differences and explain why the display can conceal change without being incorrectly rendered.
Check the two boundary values independently and confirm that the prose does not call a displayed jump an exact underlying increase. If the working question requires smaller changes than the display can distinguish, identify the missing source evidence rather than manufacturing decimal places. This exercise establishes how the declared rounding map behaves. It does not establish significance, measurement accuracy, a real product's rounding convention, or the cause of any change.
