Fraction & Percent Toolkit implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

live-source boundary

Effect

Computation or source lookup only

Input and validation requirements

A zero old-value percent-change input produces an undefined division by zero. The instrument must reject it or explicitly return undefined; any finite numeric result would be incorrect.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "operation": "simplify_fraction",
    "numerator": 84,
    "denominator": 126
  },
  "expected_outputs": {
    "simplified_fraction": "2/3",
    "decimal": "0.666666...",
    "percent": "66.666666...%"
  },
  "working": "gcd(84,126)=42. Reduce numerator: 84/42=2. Reduce denominator: 126/42=3. Therefore 84/126=2/3. Decimal: 2 ÷ 3 = 0.666666.... Percent: (2 ÷ 3) × 100 = 66.666666...%."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche2/batch10-output.jsonl