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Find Double Letter Codes

In this worksheet, students will identify a double letter code by identifying common features among images.

'Find Double 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 B twice. What do both of these shapes have in common?

They are both white faces with no shading, so the letter B must be used at the start of the code if the smiley face has no shading.

This means that a letter R at the start of the code must mean that the face is shaded.

 

What feature could the letter T refer to?

Both images with a T in their code have triangles on their heads. This must mean that the letter T is the code to show a triangular ‘hat’, whereas S must mean a square ‘hat’.

 

The final image is shaded so it will start with an R and it has a square ‘hat’ so it will end with an S.

So the correct answer is RS.


 

Let’s try another one:

Which code should be given to the final shape?

 

 

Let’s look for a letter that appears as a code more than once…That’s right, we can see the letter S twice.

What do both of the images linked by the letter S have in common?

They both have squares as the outside shape, so S must indicate that the outside shape is a square.

This means that M indicates a triangle as the outside shape and T indicates a circle.

So our final image must start with a T as the outside shape is a circle.

 

P appears as the second letter when the cross is not shaded and L appears when the cross is shaded.

 

Our final image needs to be given the code TP.

T for the outside circle and P for having an unshaded cross.


 

It’s now your turn to crack some codes!

Good luck detective.

Have a look at the shapes below, code breaker. 

 

Can you match the code to the correct description?

 

Column A

Column B

P
Stripey Shape
D
Dotted Shape
G
Blank Shape

Here's another puzzle for you to have a go at, code breaker. 

 

Can you work out the code and then match the code to the correct description?

 

Column A

Column B

S
Black Centre Shape
L
Blank Centre Shape
B
Grey Centre Shape

Have a look at the following shapes, code breaker.  

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

 

 

You know the drill now, code breaker!  Look at the shapes below.

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

 

 

Z

X

T

 Look at the shapes below.

 

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

 

 

R

M

L

Are you ready for the next challenge, code breaker?

 

Look at the shapes below. 

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

 

Ready for the next puzzle to crack?

 

Look at the shapes below. 

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

 

Look at the shapes below.

 

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

 

Here's another challenging one for you, code cracker. 

 

Look at the shapes below.

 

Use their codes to help you to match up each letter with its correct meaning. 

 

Column A

Column B

B
Blank Shape
S
Pointing Up
V
Pointing Right
R
Shaded Shape

We've reached the last question, code breaker!

 

Look at the shapes below.

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

 

 

HS

HF

HD

SD

  • Question 1

Have a look at the shapes below, code breaker. 

 

Can you match the code to the correct description?

 

CORRECT ANSWER

Column A

Column B

P
Stripey Shape
D
Dotted Shape
G
Blank Shape
EDDIE SAYS
OK code breaker - how did you do? To solve this, we first need to look for a letter that appears more than once. If you look carefully, the letter D appears twice. Now we need to look for something that these 2 shapes have in common. Did you spot that they are both dotty (get it!?) So, this must mean that the code D represents a spotty pattern. The two shapes that are coded P both have a stripey pattern so P must be the code for a striped shape. This leaves us with G which is a blank shape. Did you see how we did that? Don't worry if you didn't get it right first time, these things take practice!
  • Question 2

Here's another puzzle for you to have a go at, code breaker. 

 

Can you work out the code and then match the code to the correct description?

 

CORRECT ANSWER

Column A

Column B

S
Black Centre Shape
L
Grey Centre Shape
B
Blank Centre Shape
EDDIE SAYS
How did you feel about this one, code breaker? Did you remember to use our system? Remember, to solve this we first need to look for a letter that appears more than once. Two letters appear twice in the sequence S and B. Let's take S first. What do the two shapes labelled S have in common? They both contain a black shape in the middle. So, this must mean that code S represents a black centre shape. Now, look at B. Both shapes have a blank centre shape, so that is the code for B solved. This leaves us with L, which represents a shape with a shaded grey centre. Remember, it's sometimes worth writing the codes down on paper as you go along.
  • Question 3

Have a look at the following shapes, code breaker.  

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

 

 

CORRECT ANSWER
D
EDDIE SAYS
How did you find this one, code breaker? Did you use our helpful 'pointers' to crack the case? 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 A appears twice and both arrows point downwards. The code C also appears twice and both arrows point diagonally upwards towards the right. The last arrow, labelled D, points diagonally downwards, just like our mystery shape. So the missing code is D! Terrific detecting skills if you got this one right!
  • Question 4

You know the drill now, code breaker!  Look at the shapes below.

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

 

 

CORRECT ANSWER
X
EDDIE SAYS
Did you crack the code, code breaker? You could have worked this out through your knowledge of shapes or your counting skills. Both of the shapes that are coded T are 4-sided or quadrilaterals. Both of the shapes coded X are 3-sided shapes or triangles, which means that code Z must be the code for a circle, which is a shape with 1 continuous side. As our mystery shape is a triangle and therefore 3-sided, it must be coded as X. Great effort code breaker, let's keep going!
  • Question 5

 Look at the shapes below.

 

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

 

 

CORRECT ANSWER
L
EDDIE SAYS
Are you getting the hang of these yet, code breaker? Remember, you are always looking for similarities between shapes with the same code. You may have spotted that all of the shapes are square, so we need to look for another pattern. If you look inside the squares, they contain different quantities of shapes. It's time to start counting! When you look at the shapes coded L, you will see they each have 3 smaller shapes inside. The shapes coded M each have 2 smaller shapes inside. Finally, the shape coded R has 1 shape inside. Therefore, the number of shapes inside gives us the code - we've cracked it! Our mystery shape contains 3 smaller shapes inside it, which means that L must be the correct code here.
  • Question 6

Are you ready for the next challenge, code breaker?

 

Look at the shapes below. 

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

 

CORRECT ANSWER
TB
EDDIE SAYS
Now, this was a bit of a challenge, code breaker! You may have noticed that in this question you have two codes to crack at the same time. First, we need to crack the first letter of the code by looking at a letter that comes up more than once. The code S comes up twice. Both of the images are squares, so S at the start of the code must mean square. The other shape has a T at the start, which must mean triangle. Let's look at the second letters now. The code W comes up twice and both of these shapes are blank. So B must mean a black shaded shape. As the mystery shape is a triangle (T) and shaded black (B) the code is TB. Did you keep up? These ones are tricky but the more you do, the easier they will become.
  • Question 7

Ready for the next puzzle to crack?

 

Look at the shapes below. 

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

 

CORRECT ANSWER
SN
EDDIE SAYS
How did you do with this one, are you feeling more confident? You may have noticed when you looked at the images, that two images were happy and one was sad. The happy faces begin with the code H for happy, and the sad face begins with the code S. The other big difference between the images is that two of the faces have hats on and one doesn't. The ones with hats have C as the second letter of their code. Our hatless friend has the letter N as the second letter in his code. Our mystery face is sad (S) and hatless (N) poor guy! Therefore, the code for him is SN.
  • Question 8

Look at the shapes below.

 

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

 

CORRECT ANSWER
TS
EDDIE SAYS
How did you find this one, code breaker? As with the previous question, you have two codes to crack at the same time here. First, we need to crack the first letter of the code by looking at a letter that comes up more than once. The code C comes up twice. Both of the images are circles, so C at the start of the code must mean circle. The other shape has a T at the start which must mean triangle. Let's look at the second letters now. The code D comes up twice and both of these shapes are dotted. Did you 'spot' this? D must mean a dotted shape. The other code is an S, which matches with a stripey shape. So S must be the code for stripes! As the mystery shape is a triangle (T) and stripey (S) the code is TS. Well done if you worked this one out, detective.
  • Question 9

Here's another challenging one for you, code cracker. 

 

Look at the shapes below.

 

Use their codes to help you to match up each letter with its correct meaning. 

 

CORRECT ANSWER

Column A

Column B

B
Blank Shape
S
Shaded Shape
V
Pointing Up
R
Pointing Right
EDDIE SAYS
How many matches did you find, code breaker? Did you use the helpful 'pointers' to solve this one? Both of the arrows with an S at the start are arrows that are shaded in black. So S must stand for shaded. The other two arrows are blank and their first code letter is a B. Now it's time to look at which direction the arrow is pointing in. The two arrows pointing upwards have the code V, and the two arrows pointing to the right have the code R. Keep up the great work, code breaker, you've got this!
  • Question 10

We've reached the last question, code breaker!

 

Look at the shapes below.

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

 

 

CORRECT ANSWER
HD
EDDIE SAYS
Did you work out this last puzzle? Both of the hearts will have the code H at the start and the two squares have S at the beginning. The other pattern to spot was that the shapes had either full lines or dashed lines. The shapes that were dashed had the letter D at the end of their code and the full line shapes finished with the letter F. This makes our final code HD. Great effort, code breaker! Looking forward to seeing you again soon!
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