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Maths In Games

LEGO game maths: scale and proportion

Use age-appropriate, adult-approved play examples to compare mini builds with larger models.

Quick answer

LEGO game maths helps you understand how to make smaller builds that look like bigger things, using scale and proportion. This means you can build a tiny LEGO car that looks like a real car, or a small castle that matches a big one.

Learning outcome

By the end of this page, you will understand how to make smaller LEGO builds that look like bigger things using scale and proportion. Success signs:
  • You can explain what scale means in building
  • You can compare small and large LEGO models
  • You can build a small LEGO model that matches a big one
  • You can solve simple problems about LEGO build sizes

Why this matters

LEGO game maths helps you build things that look realistic, whether you're making a tiny spaceship that looks like a real one, or a small castle that matches a big one. This is useful for games, stories, and real building projects. It also helps you understand how things change when they get bigger or smaller.

How it works

Scale is like a recipe that tells you how much smaller or bigger something should be. When you build with LEGO, you can make a small model that looks like a big thing by using the right scale. Think of it like this:
  • If you want to make a car that is 1/10th the size of a real car, you use a 1:10 scale
  • If you want to make a house that is 1/5th the size of a real house, you use a 1:5 scale
  • If you want to make a spaceship that is 2 times bigger than a real one, you use a 2:1 scale
You can think of scale as a "ratio" – like how many LEGO bricks you use compared to how many real bricks there would be.

Examples you can see

Let's look at some LEGO examples that show scale and proportion. Example 1: LEGO Car Imagine you have a real car that is 4 metres long. If you make a LEGO car using a 1:10 scale, your LEGO car would be:
  • 4 metres ÷ 10 = 0.4 metres
  • 0.4 metres = 40 centimetres
So your LEGO car would be 40 centimetres long – about the size of a real car's wheel! Example 2: LEGO Castle A real castle might be 20 metres wide. If you make a LEGO castle using a 1:5 scale, your LEGO castle would be:
  • 20 metres ÷ 5 = 4 metres
So your LEGO castle would be 4 metres wide – that's about the size of a big room! Example 3: LEGO House A real house might be 8 metres wide. If you make a LEGO house using a 1:20 scale, your LEGO house would be:
  • 8 metres ÷ 20 = 0.4 metres
  • 0.4 metres = 40 centimetres
So your LEGO house would be 40 centimetres wide – about the size of a small table!

Try it as a mini adventure

LEGO Scale Challenge You are a LEGO architect building a city for your LEGO friends. You need to build:
  • 1 LEGO house that is 1:10 scale of a real house
  • 1 LEGO car that is 1:5 scale of a real car
  • 1 LEGO spaceship that is 2:1 scale of a real spaceship
Step 1: Measure a real house, car, or spaceship (or use a picture). Let's say:
  • Real house = 8 metres wide
  • Real car = 4 metres long
  • Real spaceship = 10 metres long
Step 2: Calculate the LEGO sizes:
  • LEGO house = 8 ÷ 10 = 0.8 metres = 80 centimetres
  • LEGO car = 4 ÷ 5 = 0.8 metres = 80 centimetres
  • LEGO spaceship = 10 × 2 = 20 metres
Step 3: Build your models! Use your LEGO bricks to make them as close to the right size as you can. Step 4: Compare your LEGO models with the real ones. Do they look right?

Common mistakes

  • Mistake: Thinking that 1:2 scale means your LEGO model is twice as big as the real thing.
    Why it happens: Confusing the order of the numbers in a scale.
    Fix: Remember that 1:2 means 1 LEGO unit for every 2 real units – so your LEGO model is half the size of the real thing.
  • Mistake: Forgetting to convert measurements.
    Why it happens: Mixing up centimetres and metres.
    Fix: Always convert to the same unit before calculating. For example, 1 metre = 100 centimetres.
  • Mistake: Using the wrong scale for the right size.
    Why it happens: Not thinking about what looks right.
    Fix: Use a 1:10 scale for small models, 1:5 for medium, and 2:1 for big models.

Parent and carer guide

LEGO game maths helps children understand how sizes change when things get bigger or smaller. Here's how to help your child:
  • Use everyday objects to show scale – like a toy car compared to a real car
  • Measure real objects together and calculate LEGO sizes
  • Encourage your child to build and compare models
  • Ask questions like "How many LEGO bricks would fit in a real house?"
  • Let them make mistakes and learn from them – this is how they grow!
When helping, remember:
  • Don't worry if they get the math wrong at first – it's part of learning
  • Keep it fun and playful – this is about creativity, not just maths
  • Use real-world examples they know – like their own bedroom or toys
  • Don't rush – let them explore and experiment

Practice questions

  1. Real car = 4 metres long. What is the LEGO size using 1:5 scale?
  2. Real house = 8 metres wide. What is the LEGO size using 1:10 scale?
  3. Real spaceship = 10 metres long. What is the LEGO size using 2:1 scale?
  4. Real castle = 20 metres wide. What is the LEGO size using 1:5 scale?
  5. Real tree = 5 metres tall. What is the LEGO size using 1:20 scale?
Answers:
  1. 4 ÷ 5 = 0.8 metres = 80 centimetres
  2. 8 ÷ 10 = 0.8 metres = 80 centimetres
  3. 10 × 2 = 20 metres
  4. 20 ÷ 5 = 4 metres
  5. 5 ÷ 20 = 0.25 metres = 25 centimetres

FAQ

What is scale in LEGO building?

Scale is how big or small your LEGO model is compared to the real thing. It helps you make tiny models that look like big things.

How do I choose the right scale?

Think about how big you want your model to be. A 1:10 scale makes small models, 1:5 makes medium models, and 2:1 makes big models.

Can I use different scales for different parts?

Yes! You can make a car with a 1:5 scale and a house with a 1:10 scale in the same city.

Why is scale important in games?

Scale helps make games look realistic and fun. It makes your LEGO world feel like it belongs in a story or video game.

How can I practice scale at home?

Measure real things and then build LEGO models that match. Try building a tiny city with different scales for cars, houses, and spaceships.