# Work Out Single Letter Codes

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

Key stage:  KS 2

Curriculum topic:   Spatial and Non-Verbal Reasoning

Curriculum subtopic:   Find the Missing Code

Difficulty level:

### QUESTION 1 of 10

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.

Welcome code breaker!

Look at the shapes below.

Use their codes to help you work out the code for the mystery shape and write the answer as a capital letter.

Right, let's try another one.

Look at the shapes below.

Use their codes to help you work out the code for the mystery shape.

E

B

C

Look at the shapes below.

Use their codes to help you work out the code for the mystery shape.

P

D

B

Look at the shapes below.

Use their codes to help you work out the code for the mystery shape

X

Z

F

Look at the shapes below.

Use their codes to help you work out the code for the mystery shape.

F

T

G

You're over halfway through this activity already, detective!

Look at the shapes below.

Use their codes to help you work out the code for the mystery shape.

N

P

L

Look at the shapes below.

Use their codes to help you work out the code for the mystery shape.

E

C

D

Look at the shapes below.

Use their codes to help you work out the code for the mystery shape.

G

B

N

Look at the shapes below.

Use their codes to help you work out the code for the mystery shape.

X

Y

Z

Look at the shapes below.

Use their codes to help you work out the code for the mystery shape.

F

M

L

• Question 1

Welcome code breaker!

Look at the shapes below.

Use their codes to help you work out the code for the mystery shape and write the answer as a capital letter.

B
EDDIE SAYS
How did you get on with this one? What do both the shapes labelled with A have in common? They are both shaded in black. This means that the code A is used for a shaded or black shape and the code B is used for a blank or white shape. Our mystery shape is blank so this means it has a code of B. Did you remember to mirror the question and use a capital letter in your code? This is important because B or b can represent two different codes in questions of this type.
• Question 2

Right, let's try another one.

Look at the shapes below.

Use their codes to help you work out the code for the mystery shape.

C
EDDIE SAYS
What do both the shapes labelled with C have in common? They are both happy, smiley shapes! Code C means a happy shape, whilst code E means a sad shape. Our mystery shape is a happy shape so it needs to be given code C. Did you get this one right, detective?
• Question 3

Look at the shapes below.

Use their codes to help you work out the code for the mystery shape.

D
EDDIE SAYS
Did you spot the pattern, code breaker? The squares are coded as D and the circles as P. As our mystery shape is a square, this means that it must also be coded D. Remember to look for images with the same code and spot the similarity.
• Question 4

Look at the shapes below.

Use their codes to help you work out the code for the mystery shape

Z
EDDIE SAYS
How did you find this one, code breaker? Remember we need to look for a pattern between the shapes that share the same code. What do the shapes labelled X have in common? This time it's not the type of shape that is the same. Did you spot they all have a solid line, whereas the shapes labelled Z all have a dashed line? So, our mystery shape must be Z, as it has a dashed outline.
• Question 5

Look at the shapes below.

Use their codes to help you work out the code for the mystery shape.

F
EDDIE SAYS
Are you getting the hang of these? Remember to take your time, it may not be immediately obvious what the pattern is. Did you ask yourself if there was a letter that came up more than once? If you did, you might have spotted that the letter F appears twice. What do both of the shapes labelled as F have in common? They are both shaded in grey. Our mystery shape is also shaded in grey, so this must mean that the missing code is F. Keep going, code breaker!
• Question 6

You're over halfway through this activity already, detective!

Look at the shapes below.

Use their codes to help you work out the code for the mystery shape.

L
EDDIE SAYS
Did you crack the code here? Both of the shapes labelled L are spotty, and both of the shapes labelled P are stripey. If we look at our mystery shape we can see it's spotty, so this must mean it needs the code L. These shapes look like they have the chicken pox!
• Question 7

Look at the shapes below.

Use their codes to help you work out the code for the mystery shape.

C
EDDIE SAYS
These look like a confusing road sign! How did you do, did it look challenging? Remember to think about why shapes with the same code are similar. If you did this, you would have seen that the arrows labelled as E are pointing upwards, whereas, the arrows labelled as C point downwards. Our mystery arrow is pointing downwards, so this must mean its code should be C.
• Question 8

Look at the shapes below.

Use their codes to help you work out the code for the mystery shape.

G
EDDIE SAYS
What do the shapes G have in common with one another? They both have a criss-cross pattern inside them. If you look at the shapes labelled B, you will see that they both stripey. Our mystery shape has a criss-cross pattern, so it needs to be given the code G. Let's try another one, code breaker...
• Question 9

Look at the shapes below.

Use their codes to help you work out the code for the mystery shape.

Y
EDDIE SAYS
Look at these cute bugs! What do the bugs labelled X have in common? They both have black shaded bodies, whereas, the bugs labelled Y have blank bodies. Our mystery bug has a blank body, so it needs to be coded Y. Last question coming up, code breaker!
• Question 10

Look at the shapes below.

Use their codes to help you work out the code for the mystery shape.

M
EDDIE SAYS
How did you do on this last one, code breaker? Did you notice that the shapes labelled M were both spotty? Code M means a spotty shape and code L represents a stripey shape in this question. Our mystery shape is a spotty shape so this means it must be an M. Well done, detective letter-cracker!
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