QS1—Ratios and fractions

Calculate, use and understand ratios and fractions.

Use qs1—ratios and fractions to connect the rule to the data and decision in the question.

This matters because qs1—ratios and fractions determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply qs1—ratios and fractions to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: QS1—Ratios and fractions is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.