Volume of Step Prisms Exercises: Calm Guidance for Parents
19 October 2026
Understanding step prisms
Step prisms are compound 3D shapes that look like a staircase. They are made by joining two or more rectangular prisms together, each with different heights. These shapes are common in 11+ maths questions, especially when practising volume calculations.
Breaking down the shape
To find the volume of a step prism, break it into simpler cuboid sections. Calculate the volume of each section separately, using the formula: volume = length × width × height. Add the results together for the total volume.
Key insight: Tackling a complex shape is much easier when you split it into smaller, familiar parts.
Common mistakes to avoid
Children often forget to include all sections, or accidentally count the same part twice. Encourage your child to label each step and check their working, making sure every section is included only once.
Practising with purpose
Use clear, labelled diagrams and work through examples together. Gradually increase the complexity of the shapes as your child gains confidence. This builds both skill and calmness when facing step prism questions in the 11+ exam.
Key insight: Regular, calm practice with worked examples helps children feel prepared and less anxious about volume problems.
