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Identify Single Letter Codes

In this worksheet, students will work out a single letter code by identifying common patterns in shapes.

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'Identify Single Letter Codes' worksheet

Key stage:  KS 2

Curriculum topic:   Spatial and Non-Verbal Reasoning

Curriculum subtopic:   Find the Missing Code

Difficulty level:  

Worksheet Overview

Get ready to be a code breaker!


Each of the shapes below has a matching code. We need to crack the code and then apply it to an extra shape.



In this type of question, the first thing we need to look for is a letter that appears as a code more than once.

We can see the letter L three times.

What do the three shapes linked by the letter L have in common?

They are all shaded black, so the letter L must mean that a shape is shaded black.

So the letter M must mean that the shape is not shaded.

We must give the final shape the code letter M, as it is not shaded.


Let’s try another one:

Which code should the final shape have?



Let’s look for a letter that appears as a code more than once…That’s right, we can see the letter T twice.

What do the two shapes linked by the letter T have in common?

Both of these shapes have a perimeter of a dashed line, so the letter T must mean that a shape has a dashed line perimeter.

We can also see the letter P appear twice as a code.

Both of these shapes have a perimeter formed of a normal solid line, which must mean that the code P is used for shapes with solid line perimeters.

Our final shape needs to use the code P as it has a perimeter which uses a solid line.


It’s now your turn to crack some codes!


Good luck detective.

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