C.1.4—Order-of-magnitude calculations

Make order-of-magnitude calculations, including evaluating equations whose variables have different orders of magnitude.

Use c.1.4—order-of-magnitude calculations to connect the rule to the data and decision in the question.

This matters because c.1.4—order-of-magnitude calculations determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply c.1.4—order-of-magnitude calculations to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: C.1.4—Order-of-magnitude calculations is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.