6.P9—Significant figures

Use appropriate numbers of significant figures based on the experimental data.

Use .p9—significant figures to connect the rule to the data and decision in the question.

This matters because .p9—significant figures determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply .p9—significant figures to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: .P9—Significant figures is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.