# Identify 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.

Hello and welcome to another exciting challenge, detective!

Look at the shapes below.

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

P

T

W

S

Hi there shape sorter!  Look at the following shapes.

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

A

B

C

Here's another shape sorting problem for you to solve!

Look at the shapes below and use their codes to help you work out the code for the mystery shape.

L

X

M

Have you seen the little bugs hanging out below?  We need to classify the mystery bug that is at the end of the line.

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

B

M

F

Let's keep sorting these shapes and cracking the codes!  Here's another problem to try and solve.

Look at the arrows below, can you use their codes to help you work out the code for the mystery shape?

L

R

U

Right code breaker - it's time for another.

Look at the shapes below and use their codes to help you work out the code for the mystery shape.

M

Y

W

Codebreaker, you've been making excellent progress.  Could you give us a hand with this next question, please?

Look at the group of shapes below.

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

M

Y

W

Here is another conundrum for you to solve, code breaker.

Look at the following shapes and work out the code for the mystery shape. Write your answer as a capital letter.

You know the drill now, code breaker - it's time to solve the next challenge.

Using the images below, can you find the similarity to crack the missing code for the final shape? Use a capital letter for your answer.

Look at the shapes below.

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

E

F

C

• Question 1

Hello and welcome to another exciting challenge, detective!

Look at the shapes below.

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

P
EDDIE SAYS
How did you get on with this first one, detective? There are 3 different letter codes to look at here. We need to find a letter that comes up more than once. We can see T twice and both of these shapes are shaded grey, so T is the code for a grey shaded shape. We can also see the letter P twice and both of these shapes are shaded black, so P is the code for a black shaded shape. How is our mystery picture shaded? It is shaded black so it has to be coded as P. Well done if you got this one right, sometimes the first question when learning a new skill is the hardest!
• Question 2

Hi there shape sorter!  Look at the following shapes.

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

A
EDDIE SAYS
How did you get on? To solve this one, you need to look for a letter that appears more than once. Did you spot it? There are two B,s and these shapes both have a dashed line. There are also two A,s and these shapes both have a dotted line. C is our only shape that has a full line, so we can discount this straight away! Our mystery shape has a dotted line so the correct answer here is A.
• Question 3

Here's another shape sorting problem for you to solve!

Look at the shapes below and use their codes to help you work out the code for the mystery shape.

M
EDDIE SAYS
Did you spot the pattern, code breaker? This question was a little bit different, so don't panic if you found it tricky. When you look at the shapes, the pattern is not immediately obvious. With a question like this, you need to next think about counting! The only thing that you can count in this question is the number of sides each shape has. Now, can you see where the answer comes from? All of the shapes labelled X have 4 sides, whereas the shapes labelled M have five sides. The mystery shape is a 5-sided shape, which means that it must be labelled M. You might know that a 5-sided shape is called a pentagon but did you know that all 4-sided shapes can be grouped under the fancy name quadrilateral? That's one for your own glossary of terms!
• Question 4

Have you seen the little bugs hanging out below?  We need to classify the mystery bug that is at the end of the line.

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

B
EDDIE SAYS
How did you find this one, code breaker? Remember, first we look to see if there is a code that appears more than once. Once we have found it, we look to see if we can find a similarity between the two images. The code M appears twice and both these bugs are coloured black. The code F also appears twice and both of the bugs labelled F are white in colour. The last bug, labelled B, is grey in colour, just like our mystery shape, so the missing code is B.
• Question 5

Let's keep sorting these shapes and cracking the codes!  Here's another problem to try and solve.

Look at the arrows below, can you use their codes to help you work out the code for the mystery shape?

R
EDDIE SAYS
Are you getting the hang of these? It looks like a confusing road sign but just work it through, the way you've been practising. 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 may have spotted that the letter L appears twice. What do both of the arrows labelled L have in common? They are both pointing to the left. The code U also appeared twice. Did you spot that the arrows labelled U are pointing in an upward direction? Our mystery shape is pointing to the right, as is the arrow that is labelled R. Therefore, our mystery shape must be also coded R. This question was all about direction, and knowing your lefts and rights definitely helps here!
• Question 6

Right code breaker - it's time for another.

Look at the shapes below and use their codes to help you work out the code for the mystery shape.

Y
EDDIE SAYS
Did you crack the code here? Both of the shapes labelled Y are spotted, and both of the shapes labelled W are stripey. The shape that is coloured black has the code M, but we know that our mystery shape is quite different from this! Our mystery shape, is a spotted one, so it means that it must need the code Y. Great effort code breaker - on we go to the next challenge!
• Question 7

Codebreaker, you've been making excellent progress.  Could you give us a hand with this next question, please?

Look at the group of shapes below.

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

EDDIE SAYS
How did you do with this one? Remember the system - we are looking for similarities between shapes that have the same code. In this case there are three shapes labelled S. What do they have in common? Did you spot they have a double line? The shapes labelled G all have a single line. When we look at our mystery shape, it is double lined, so it must also be coded S. Did you remember to use a capital for your answer? This is really important when writing out code.
• Question 8

Here is another conundrum for you to solve, code breaker.

Look at the following shapes and work out the code for the mystery shape. Write your answer as a capital letter.

W
EDDIE SAYS
This one was a tricky one, so don't panic if you struggled a little. It looks like the code is to do with the straight or wiggly edges of the shape, but this does not work for all of the shapes. What we need to remember is to look for the common themes between shapes with the same code. If you look carefully, you will see that all of the shapes labelled M are positioned in a horizontal or landscape position (other words for sideways) In contrast, the shapes labelled W are in a vertical or portrait position (other words for upright). When we check our mystery shape, we see that this is also in a vertical position, so the code must be W. Remember, if it seems difficult then the trick is to take a deep breath and take your time until you spot the similarity.
• Question 9

You know the drill now, code breaker - it's time to solve the next challenge.

Using the images below, can you find the similarity to crack the missing code for the final shape? Use a capital letter for your answer.

S
EDDIE SAYS
How did you do, code breaker? Remember to start by looking for a letter that appears more than once. M comes up twice and both of the shapes have a criss-cross pattern inside. S comes up twice and both these shapes have vertical stripey lines inside. When we look at our mystery shape we see that it also has vertical stripey lines and should, therefore, be coded S. There is also one shape labelled W which has horizontal stripey lines inside, but that is not the same as our mystery image so we can discount it. Did you remember to use a capital letter when writing your answer? 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.

C
EDDIE SAYS
How did you do on this last one, code breaker? This question was fraction themed! What fraction of the shapes coded F are shaded in? These shapes have a quarter shaded. If you look at the shapes coded C, they have half of their shape shaded in. Our mystery shape is also half shaded which means C must be the answer! Great work code cracker!
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