IGCSE Math RevisionExam tip poster: Reverse percentages (IGCSE Maths 4MA1 Higher)
A4 portrait. It is drawn in vector form, so it also prints sharply scaled up to A3.
The poster
The maths
A common mistake the examiners point out: Reverse percentages: finding a percentage of the new amount. What to do instead: Write "original × multiplier = new", then divide. Check by multiplying back.