One idea per line: formula in words or symbols, then substitution, then simplification.
Key formulas
Make the path visible
Markers award method marks when they can see the correct relationship even if arithmetic fails later.
Equal signs
Keep a vertical chain of true equalities. Do not write “= 5 = 7” by accident when changing the expression.
Conclusion line
End with “Therefore the height is 12 cm.” It answers the command word plainly.
Worked example
Worked example
Problem. Rewrite “V=1/3*36*5=60” as four exam-ready lines for a pyramid volume.
Solution. Base area = 6 × 6 = 36 cm². Volume formula: V = (1/3) × base area × height. Substitute: V = (1/3) × 36 × 5 = 60. Therefore the volume is 60 cm³.
Messy vs clear
A spider diagram of numbers rarely gets the same credit as a linear write-up.
Review quiz
Which line best protects method marks?
Practice questions
- Rewrite a messy solution as four clean lines.
- What belongs on the final line of a “find the volume” question?
Study notes
Can I skip writing the formula?
A named theorem or formula line protects method marks — keep it.