B.0.1—Decimal and standard form

Recognise and use decimal, ordinary and standard form; choose appropriate decimal places; calculate with the Avogadro constant; and retain significant figures when converting between forms.

Use b.0.1—decimal and standard form to connect the rule to the data and decision in the question.

This matters because b.0.1—decimal and standard form determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply b.0.1—decimal and standard form to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: B.0.1—Decimal and standard form is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.