SEAGReady
MeasurementP6 level15 questions in the full course

Perimeter of RectanglesSEAG Practice Questions

Calculating the perimeter of rectangles by adding all four sides or using the formula 2 × (length + width).

Where your child meets this in real life: Calculating fencing needed for a garden or border trim for a picture frame

What your child needs to know

SEAGReady breaks perimeter of rectangles into 2 steps, taught in order so each skill builds on the last.

  1. 1

    All Sides Labelled

    Calculate the perimeter of a rectangle when all four sides are labelled on the diagram

  2. 2

    Using Length and Width

    Calculate the perimeter when only length and width are given, using the rectangle property that opposite sides are equal

Try these SEAG-style questions

Three free sample questions from our perimeter of rectangles course. Every question comes with a full explanation, and hints that guide without giving the answer away.

Question 1Confidence builder

Reece is putting tape around the edge of a rectangular poster. Its four sides measure 10 cm, 6 cm, 10 cm and 6 cm. How much tape does Reece need?

A rectangle with opposite sides labelled 10 cm and 6 cm; its complete boundary is highlighted.
Answer choices for question 1
Question 2Confidence builder

A rectangular playground is 40 metres long and 20 metres wide. What is the perimeter of the playground?

A rectangle labelled 40 m along the top and 20 m down the left side; its complete boundary is highlighted.
Answer choices for question 2
Question 3Confidence builder

Leah is measuring the edge of a rectangular photo frame. The sides measure 15 cm, 10 cm, 15 cm, and 10 cm. What is the perimeter of the frame?

A rectangle with opposite sides labelled 15 cm and 10 cm; its complete boundary is highlighted.
Answer choices for question 3

Try the lesson: All Sides Labelled

This is the exact interactive worked example your child sees in SEAGReady. Step through it and watch the method build up.

Freya is putting ribbon around the edge of a rectangular birthday card. The card measures 12 cm, 8 cm, 12 cm, and 8 cm on each side.

How much ribbon does Freya need?

12 + 8 + 12 + 8

Understand what perimeter means
1

Perimeter is the total distance around a shape

Step 1 of 4

Prefer to read? See every step written out

Freya is putting ribbon around the edge of a rectangular birthday card. The card measures 12 cm, 8 cm, 12 cm, and 8 cm on each side.

How much ribbon does Freya need?

  1. 1

    Understand what perimeter means

    • Perimeter is the total distance around a shape
    • We need to add all four sides together
  2. 2

    Add all four sides

    • Add the sides in order around the shape12 + 8 + 12 + 8
    • Calculate the total= 40 cm

Freya needs 40 cm of ribbon.

The key insight: Perimeter means going all the way around - don't miss any sides!

Common mix-up: 12 + 8 = 20 cm. Only adding two sides gives half the perimeter. A rectangle has four sides!

Mistakes to watch for

These are the misconceptions we see most often in perimeter of rectangles, including the ones our practice questions are specifically designed to catch.

  • Only adding two sides instead of all four
  • Confusing perimeter with area (multiplying instead of adding)

Build these skills first

Struggling with perimeter of rectangles? The real gap is often in one of these earlier topics.

Add 2-Digit Numbers (With Carry)

More measurement practice

Know Metric Unit NamesUnderstand Metric PrefixesConvert Length UnitsConvert Mass UnitsConvert Capacity UnitsConvert Units with Decimals
15 questions on this topic alone

Master perimeter of rectangles and everything it unlocks

SEAGReady finds the exact step where your child gets stuck, teaches it with worked examples like the one above, and brings it back for review so it sticks.

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