# Filled percentage claim card

These catalogue counts and snapshot labels are original invented teaching data. They are not observed blog analytics, ONS statistics, customer results or experimental findings. The card records arithmetic and wording, not a cause or a judgment about catalogue quality.

## Supplied counts and shares

Scope: one fictional resource catalogue, separate supplied snapshots A, B and C. Selected files are checklists; the total includes all files in each snapshot. Unit: files, count. Every selected file belongs to its stated total.

| Snapshot | Selected count | Total count | Share calculation |
|---|---:|---:|---|
| A | 4 | 20 | 4 / 20 × 100 = 20% |
| B | 6 | 20 | 6 / 20 × 100 = 30% |
| C | 6 | 40 | 6 / 40 × 100 = 15% |

## Completed claim: B compared with A

- Comparison baseline: A, selected count 4, total 20, share 20%.
- Comparison end: B, selected count 6, total 20, share 30%.
- Selected-count difference: 6 - 4 = 2 files.
- Percentage-point difference: 30 - 20 = 10 percentage points.
- Relative change in share: (30 - 20) / 20 × 100 = 50%.
- Completed sentence: In the invented catalogue, the checklist share rose from 20% to 30%, an increase of 10 percentage points.
- Alternative completed sentence: In the invented catalogue, the checklist share rose by 50% relative to its starting share of 20%.
- Limit: This calculation does not establish why any real catalogue changed. The equal denominator explains why the relative count increase and relative share increase agree in this teaching comparison.

## Completed claim: C compared with A

- Comparison baseline: A, selected count 4, total 20, share 20%.
- Comparison end: C, selected count 6, total 40, share 15%.
- Selected-count difference: 6 - 4 = 2 files.
- Percentage-point difference: 15 - 20 = -5 percentage points.
- Relative change in share: (15 - 20) / 20 × 100 = -25%.
- Completed sentence: The invented catalogue has 6 checklists instead of 4, while their share falls from 20% to 15% because the supplied total changes from 20 to 40 files.
- Limit: The count rose while the share fell. The arithmetic does not imply a cause, significance or better performance.

## Zero and missing inputs

Separate invented comparison: old share 0%, new share 10%.

- Difference: 10 - 0 = 10 percentage points.
- Relative change using the old-share denominator: UNDEFINED; division by zero cannot produce a relative percentage change under this formula.
- Completed sentence: The teaching share moves from 0% to 10%, a rise of 10 percentage points.

Missing old share: UNKNOWN until its supporting value is supplied. A total count of zero also leaves the share calculation undefined. Keep the actual counts and source notes without inventing a rate.

## Reuse for your own claim

Copy this entry and replace it with actual source-bound values. The completed examples above remain teaching data.

- What is selected, and what total does it belong to?
- Unit, scope, period and source of each count:
- Baseline selected count, total count and share:
- End selected count, total count and share:
- Count difference and unit:
- Share formula and calculated values:
- Percentage-point difference:
- Relative percentage change, if its baseline permits calculation:
- Which difference does the exact sentence describe?
- Unknown values, zero denominator, rounding and other source limits:
- Final sentence checked against the actual supporting values:

The terminology distinction is supported by the [ONS percentage guidance](https://service-manual.ons.gov.uk/content/numbers/percentages), read October 8, 2026. All example values, formulas and catalogue wording here are original teaching content; ONS did not supply this dataset.