Curriculum requirements
No official curriculum alignment is claimed. Check required notation, methods and examination content with your school, teacher or education authority.
Practical examples
Financial, energy, fuel and purchasing examples use illustrative prices and simplified assumptions. They are learning exercises rather than personalised financial advice or current product offers.
Physical models
Calculators do not replace measurement, professional judgement or safety guidance. Stopping-distance results are not driving recommendations. Circuit examples are virtual; they are not instructions to work on electrical installations. Do not use classroom models to decide safety-critical actions.
Units and rounding
Answers state their units. Displayed calculator values are rounded for readability. Quiz checks accept a small numerical tolerance; use at least three significant figures for non-exact answers. Retain unrounded intermediate values where possible.