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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.

Welcome code breaker, we're pleased to see you!

 

Have a look at the shapes below.

Can you match the code to the correct description?

 

Column A

Column B

O
Inside shape is a circle
T
Inside shape is a square
S
Outside shape is a triangle
C
Outside shape is a circle

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

 

Can you work out the code below and match the letters to their descriptions?

 

 

Column A

Column B

S
A Full Straight Line
D
Pointing Right
F
Pointing Down
R
A Wiggly Line
U
A Dashed Line
L
Pointing Left
T
Pointing Up

Have a look at the following shapes, code breaker.  

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

 

 

You know what to do by now, code breaker! 

 

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. 

 

 

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. 

 

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 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. 

 

 

 

We've reached the last question, code breaker - let's make it a good one!

 

Look at the shapes below.

Can you match the code to the description of the shape?

 

Column A

Column B

H
Blank Eyes
S
Shaded Eyes
B
Sad Face
W
Happy Face
  • Question 1

Welcome code breaker, we're pleased to see you!

 

Have a look at the shapes below.

Can you match the code to the correct description?

 

CORRECT ANSWER

Column A

Column B

O
Outside shape is a circle
T
Outside shape is a triangle
S
Inside shape is a square
C
Inside shape is a circle
EDDIE SAYS
OK code breaker, how did you do? How many matches did you find? Both of the images that have an O at the start of their code have a circle as the outer shape. Both of the images that have a T at the start of their code have a triangle as the outer shape. When we look at the second letter of the code, images with an S at the end have a square in the middle, whereas images with a C at the end have a circle in the middle. Did you follow this? If you didn't get it right first time, do not worry - these things take practice!
  • Question 2

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

 

Can you work out the code below and match the letters to their descriptions?

 

 

CORRECT ANSWER

Column A

Column B

S
A Wiggly Line
D
A Dashed Line
F
A Full Straight Line
R
Pointing Right
U
Pointing Up
L
Pointing Down
T
Pointing Left
EDDIE SAYS
Did you crack the code here? All of the arrows with a wiggly line have the code S at the start. All of the arrows with a dashed line have the code D at the start. The arrow that is a full straight line has the code F at the start. Did you work those out, detective? Now we need to look carefully at the second letters. For this, we need to consider which direction the arrow is pointing in. The arrow pointing to the right ends with the code R, all arrows pointing downwards end with the code L and all arrows pointing upwards end with the code U. Finally, the arrow pointing left ends with the code T. Well done if you got this, you are definitely heading in the right direction!
  • 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. 

 

 

CORRECT ANSWER
HF
EDDIE SAYS
Did you crack the code here? What did you notice about all of the shapes that have T at the start of their code? That's right, they are all triangles. The images which start with H are hearts, and the images starting with R are rectangles. We know that our mystery shape is a heart, so we know that its code will begin with H. Let's look at the second letters now. Those with an F at the end are shaded black and guess what, so is our mystery shape! So we have cracked it - the missing code is HF.
  • Question 4

You know what to do by now, code breaker! 

 

Look at the shapes below.

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

 

 

CORRECT ANSWER
BP
EDDIE SAYS
Did you crack the code, code breaker? Did you manage to decode our bugs here? We can see the letter G at the start twice. In both cases, the bugs are rectangular in shape. The triangular-shaped bugs have the code T at the start, and code B is linked to the bug with an oval body. Our mystery bug has an oval body, so we need to remember this. The other difference between the bugs is the number of legs that they have. All the bugs with W as the second letter of their code, have one pair of legs. All of the bugs with P at the end, have a greedy three pairs of legs... they must be fast! Our mystery bug is an oval (B) and has three pairs of legs (P) so the code must be BP for our little bug.
  • Question 5

 Look at the shapes below.

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

 

 

CORRECT ANSWER
GQ
EDDIE SAYS
How are you getting on with these? Remember you are always looking for similarities between shapes with the same code. You may have spotted that all of the shapes have either two or three horizontal lines going through the vertical line. The letter P as the first letter means that there are two horizontal lines, and if there are three lines, the code is a G. Our mystery shape has three lines, so this will begin with a G. Now we need to look for a second pattern, and if you look carefully, the shapes either have a circle, triangle or square at the base. Those shapes with a triangle at the base have the letter L as the second part of the code. Shapes with a square at the base have the letter M. Our mystery shape has a circle at the base, which is coded by having Q as the second letter. We've cracked it!
  • 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
LQ
EDDIE SAYS
Now, this was a bit of a challenge, code breaker! It's fraction time! Let's mix them in with our coding skills. First, we need to crack the first letter of the code by looking at a letter that comes up more than once. The code R comes up twice. Both of the images are squares so R at the start of the code must mean square. By the same principle, C must be a circle and L must be a rectangle. Let's look at the second letters now. The code Q comes up twice and both of these shapes have a quarter of the shape shaded. So, Q must mean a quarter-shaded shape. H looks like it is the code for a shape when half of it is shaded. As the mystery shape is a rectangle (L) and a quarter-shaded (Q) the code is LQ. Did you keep up? These ones are tricky but the more you do, the easier they will become.
  • Question 7

Look at the shapes below.

 

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

 

CORRECT ANSWER
VS
EDDIE SAYS
Are you getting the hang of these double codes? First, we need to crack the first letter of the code by looking at a letter that comes up more than once. What do you notice about the shapes with code V at the beginning? They are both standing in a vertical position. The shapes beginning with H are both lying down or horizontal. The shapes with S at the end of their codes are spotted shapes, whereas the shape that is blank in the middle has a B at the end. As the mystery shape is vertical (V) and spotted (S) the code is VS. Are you feeling more confident now?
  • Question 8

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

 

Look at the shapes below. 

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

 

CORRECT ANSWER
LW
EDDIE SAYS
How did you get on with this one? As always we must start to solve the code by looking for a letter that appears more than once. In this case, the letter T appears twice and the letter B does also. We can work out that T appears every time the outside shape is a circle, and B when it is a triangle. It is therefore clear that L is the code for an outside shape that is a square. We should remember this as our mystery shape is a square. Now, we should look at the second letter. All of the shapes contain a smaller square within them. When the square is shaded black, the second letter in the code is P, and when it is blank, the code is W. Our mystery shape is a square (L) and has an inside blank square (W), so the code is LW. Keep up the great work, code breaker, you've got this!
  • Question 9

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
CG
EDDIE SAYS
How did you do with this one, are you feeling more confident? Did you begin by looking for the letter that appears more than once? The letter A appears twice and both of these images are made up of circles. The first letter must tell us about the type of shape it is. A = circles B = squares C = triangles Let's now look at the second letter. L comes up three times, so what do these shapes have in common? They are made up of three shapes. Images with a G at the end are made up of two shapes. The mystery image is made up of triangles (C) and has two shapes (G), so the code for it is CG. Let's go onto the last question!
  • Question 10

We've reached the last question, code breaker - let's make it a good one!

 

Look at the shapes below.

Can you match the code to the description of the shape?

 

CORRECT ANSWER

Column A

Column B

H
Happy Face
S
Sad Face
B
Shaded Eyes
W
Blank Eyes
EDDIE SAYS
How happy were you with this last question? All of the faces that have an H at the start are happy faces, whereas the faces that are sad begin with an S. The only other difference between the faces is their eyes - did you see that? The ones with code B as their second letter have shaded eyes and the ones with code W have blank eyes. This has all been like a game of spot the difference! Great effort, code breaker! Looking forward to seeing you again soon!
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