3.5.1 - Calculations with significant figures

Perform calculations using the correct number of significant figures.

Use - calculations with significant figures to connect the rule to the data and decision in the question.

This matters because - calculations with significant figures determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply - calculations with significant figures to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: - Calculations with significant figures is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.