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Find Single Letter Codes

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

'Find 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

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 code breaker. Are you ready to begin?

 

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.

 

Look at the shapes below.

 

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

 

M

N

T

Look at the shapes below.

 

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

 

G

H

F

Look at the shapes below.

 

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

 

J

S

X

Look at the shapes below.

 

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

 

P

X

T

You're over halfway there, shape detective!

 

Look at the shapes below.

 

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

 

T

X

L

Look at the shapes below.

 

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

 

K

X

H

Look at the shapes below.

 

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

 

C

L

Z

Look at the shapes below.

 

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

 

P

Z

X

Look at the shapes below.

 

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

 

L

Q

Y

  • Question 1

Hello code breaker. Are you ready to begin?

 

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.

 

CORRECT ANSWER
S
EDDIE SAYS
Welcome, shape detective! This is a healthy-looking question! What do both of the fruits labelled S have in common? They are both spotty! Let's hope it's not mould! The fruits labelled D are both blank. Our mystery shape is spotty, so it needs a code S. Did you remember to use a capital letter in your code?
  • Question 2

Look at the shapes below.

 

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

 

CORRECT ANSWER
T
EDDIE SAYS
What do both the shapes labelled N have in common? They both have 4 sides. We call these shapes quadrilaterals. The shapes coded T are both triangles. Our mystery shape is also a triangle, so it needs a code T.
  • Question 3

Look at the shapes below.

 

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

 

CORRECT ANSWER
G
EDDIE SAYS
Did you spot the pattern, code breaker? Try not to stare at these shapes for too long or it might make your eyes go funny! The shapes coded F both have a dashed line, and the shapes coded G both have a dotted line. What kind of line does the mystery shape have? It's dotted, so it needs a code G.
  • Question 4

Look at the shapes below.

 

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

 

CORRECT ANSWER
J
EDDIE SAYS
How did you find this one, code breaker? We have two code J's and two code S's. The shapes with code J are all standing up. We call this a vertical position. The shapes with code S are all lying down. We call this a horizontal position. The mystery shape is standing up, so it needs a code J. Did you follow this? Let's try another.
  • Question 5

Look at the shapes below.

 

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

 

CORRECT ANSWER
P
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 may have spotted that the letter T and P appear twice. So, let's look at the bugs labelled P. What do both of these bugs have in common? They are both happy! Our bugs labelled T are sad. Our mystery shape is a happy bug, so he needs the code P. Keep going, code breaker!
  • Question 6

You're over halfway there, shape detective!

 

Look at the shapes below.

 

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

 

CORRECT ANSWER
L
EDDIE SAYS
Did you crack the code here? We have to look really carefully at the lines here. Both of the shapes labelled L have diagonal lines going in the opposite direction to the shapes coded T Do the diagonal lines in our mystery image match the lines of code L or code T. They match code L. Are you finding these are getting easier with practice, shape detective?
  • Question 7

Look at the shapes below.

 

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

 

CORRECT ANSWER
K
EDDIE SAYS
This question needs us to count the smaller shapes inside the larger shapes. What do the images coded H have in common? They both have three mini shapes inside them. What do the images coded K have in common? They both have two mini shapes inside them. Our mystery shape has two mini shapes inside it, so we need to code it as K.
  • Question 8

Look at the shapes below.

 

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

 

CORRECT ANSWER
C
EDDIE SAYS
Counting the number of lines here is going to help us crack the code! How many lines are in the shapes coded C? There are three lines. The shapes coded L only have two lines. Our mystery shape has three lines so it needs to be coded as code C. 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. 

 

CORRECT ANSWER
P
EDDIE SAYS
We have some more bug friends here! How many pairs of legs do bugs with code P have? They have two pairs of legs, whereas bugs with code Z have three pairs of legs. Our mystery shape has two pairs of legs, which means it needs to be coded P. 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. 

 

CORRECT ANSWER
Y
EDDIE SAYS
How did you do on this last one, code breaker? What do the shapes labelled Y have in common? They all have four sides. Four-sided shapes are called quadrilaterals. The shapes labelled L have three sides. The mystery shape is also a quadrilateral and needs to be coded Y. Well done, detective code breaker!
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