SEAGReady
MeasurementP7 level16 questions in the full course

Calculate Scale MeasurementsSEAG Practice Questions

Using the scale to convert a real-life measurement to what it should be on the drawing (e.g., 6 m at 1:100 = 6 cm).

Where your child meets this in real life: Drawing a plan of your bedroom to scale or creating a map of the school grounds

What your child needs to know

SEAGReady breaks calculate scale measurements into 2 steps, taught in order so each skill builds on the last.

  1. 1

    Same Units

    Calculate the drawing measurement when the real-life measurement uses the same unit as the scale (e.g., 500 cm at 1:100 = 5 cm)

  2. 2

    Unit Conversion Required

    Calculate the drawing measurement when the real-life measurement is in different units (e.g., 6 m at 1:100 = 6 cm)

Try these SEAG-style questions

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

Question 1Confidence builder

Josh uses the bedroom-plan information shown. How long should the wall be on his drawing?

A bedroom-plan wall has unknown drawing length, scale 1 to 100 and real length 300 cm.
Answer choices for question 1
Question 2Confidence builder

Niamh uses the playground-plan information shown. How wide should the playground be on her drawing?

A playground has unknown drawing width, scale 1 to 100 and real width 6 metres.
Answer choices for question 2
Question 3Confidence builder

Georgia uses the classroom-plan information shown. How tall should the door be on her drawing?

A vertical classroom door has unknown drawing height, scale 1 to 50 and real height 200 cm.
Answer choices for question 3

Try the lesson: Same Units

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

Lily is drawing a scale plan of her classroom for a school project. The classroom wall is 400 cm long. She uses a scale of 1:100.

How long should the wall be on her drawing?

400 cm ÷ 100

Identify the scale factor
1

Scale 1:100 means 1 cm on drawing = 100 cm in real life

Step 1 of 4

Prefer to read? See every step written out

Lily is drawing a scale plan of her classroom for a school project. The classroom wall is 400 cm long. She uses a scale of 1:100.

How long should the wall be on her drawing?

  1. 1

    Identify the scale factor

    • Scale 1:100 means 1 cm on drawing = 100 cm in real life
    • To go from real to drawing, we divide by 100
  2. 2

    Calculate the drawing length

    • Divide the real measurement by the scale factor400 ÷ 100 = 4
    • The wall is 4 cm on the drawing

The wall should be 4 cm long on Lily's drawing.

The key insight: Real to drawing is the opposite of drawing to real - so we divide instead of multiply!

Common mix-up: 400 × 100 = 40,000 cm. Multiplying makes the drawing bigger than real life - we need to divide to shrink it.

Mistakes to watch for

These are the misconceptions we see most often in calculate scale measurements, including the ones our practice questions are specifically designed to catch.

  • Multiplying instead of dividing to find drawing measurement
  • Unit confusion when real measurement is in metres but scale uses cm
  • Not checking if the answer is sensible for a drawing

Build these skills first

Struggling with calculate scale measurements? The real gap is often in one of these earlier topics.

Calculate Real-Life Measurements

More measurement practice

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

Master calculate scale measurements 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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