3.4.3 - Significant figures

Evaluate the significant figures used.

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

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

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

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