Perimeter word problems 11 plus
21 October 2026
Understanding perimeter
Perimeter is the total distance around the edge of a shape. In 11+ word problems, children are often asked to calculate the perimeter of simple or compound shapes using the information given.
How to approach perimeter word problems
Start by identifying the shape in the question. Next, write down all the side lengths. If any sides are missing, use clues from the problem to work them out. Always check the units are the same before you start calculating.
Worked example
A rectangle has a length of 5 cm and a width of 4 cm. What is its perimeter?
First, write the formula for the perimeter of a rectangle: Perimeter = 2 × (length + width)
Add the length and width: 5 cm + 4 cm = 9 cm
Multiply by 2: 2 × 9 cm = 18 cm
The correct answer is 18 cm.
Key insight: Perimeter questions often test careful reading as much as calculation. Watch for missing sides, mixed units, or shapes made from more than one rectangle.
Why practice matters
Regular practice with perimeter word problems helps children feel confident when facing these questions in the 11+ exam. It builds both their calculation skills and attention to detail.
In summary
Supporting your child with perimeter word problems is a practical way to prepare for the 11+. Step-by-step practice makes the process feel manageable and helps avoid common mistakes.
