Area of Compound Shapes Practice for 11+ Maths
19 October 2026
How compound shapes appear in 11+ exams
Compound shapes in the 11+ are often made by joining two or more rectangles to form an L-shape or a shape with a missing corner. These questions are common in both CEM and GL papers. Children are usually given some side lengths, but at least one is left out for them to work out.
A clear method: split and add
The most reliable way for children to find the area is to split the compound shape into smaller rectangles. Calculate the area of each rectangle separately, then add the areas together. Encourage your child to draw lines on the diagram to show their split, and to label every side clearly.
Spotting missing lengths
A key challenge is finding sides that are not labelled. Remind your child to look at the total lengths along each edge. Often, the missing length can be found by subtracting one labelled part from the total. Careful checking here prevents mistakes later.
Common pitfalls to avoid
Children sometimes mix up area and perimeter, or forget to include all sections in their calculation. Others rush subtractions and misread diagrams. Practising with a variety of shapes and double-checking each step helps build confidence and accuracy.
Key insight: Focus on understanding the diagram, not just the calculations. The real test is whether your child can interpret the shape, find any hidden lengths, and stay organised throughout the process.
Where to find structured practice
EEZY BREEZY MATHS offers targeted worksheets and interactive packages designed for 11+ area of compound shapes, matching both GL and CEM exam styles. These resources guide your child through step-by-step practice with instant feedback and built-in mistake review.
