Write the ratio 15 : 35 in its simplest form.
There are red shapes and blue shapes in a box, 23\displaystyle \frac{2}{3}32 of the shapes are red.
Write the ratio of red shapes to blue shapes.
15 exam-style questions on CIE IGCSE Maths Writing and Simplifying Ratio. Each one has a worked solution and a mark scheme showing where the marks go.