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Identify Double Letter Codes

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

'Identify 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 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

D
The middle of the flower is shaded
B
The stem has two leaves
O
The middle of the flower is blank
T
The stem has one leaf

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

 

Can you work out the code for the mystery symbol?

 

 

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 the drill now, code breaker! 

 

Look at the shapes below.

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

 

You're halfway through this activity already!

 

 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. 

 

 

 

Column A

Column B

X
Dashed line
Y
Dotted line
Z
Full line
T
Triangle shape
C
Circle shape
S
Square 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. 

 

For the final question ...

 

Look at the shapes below.

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

 

Column A

Column B

T
Blank Flag
L
Rectangle Flag
R
Triangle Flag
S
Shaded Flag
N
Flag With Points
  • 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

D
The middle of the flower is blan...
B
The middle of the flower is shade...
O
The stem has one leaf
T
The stem has two leaves
EDDIE SAYS
OK code breaker, how did you do? How many matches did you find? Both of the images that have a D at the start of their codes have a blank centre, whereas the flowers with code B have a shaded middle. Both of the flowers with O at the end have one leaf at the bottom, whereas the flowers with a T at the end, have two. 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, code breaker. 

 

Can you work out the code for the mystery symbol?

 

 

CORRECT ANSWER
QT
EDDIE SAYS
Did you crack the code here? Remember to always start by looking for the pattern between shapes with the same code. All of the images with a C at the start have a square on the outside. The first letter of the code tells us about the outside shape. C = square on the outside L = triangle on the outside Q = circle on the outside Let's move on to the second letter now. All of those with a U at the end of the code have a circle inside. This means that the second letter tells us about the inside shape. U = circle on the inside T = square on the inside So, this makes our mystery shape QT because it is a circle(Q) with a square on the inside(T). Keep using those detective skills!
  • 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
OS
EDDIE SAYS
Did you crack the code here? What did you notice about the three images with L at the start of their code? They have a smaller version of their shape contained inside. Those with O at the start are made up of two of the same shape attached diagonally. L = one shape inside the other O = two shapes touching diagonally Now, let's look at the second letter of the codes. Those with H at the end are made up of square shapes. Those with S at the end are made of circles and those with D, are made up of triangles. The mystery image has two shapes touching diagonally (O) and is made of circles (S) so the code must be OS.
  • 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
UF
EDDIE SAYS
Did you crack the code, code breaker? Did you manage to decode our shapes here? Is there a common letter at the start of the codes? We can see U twice and both of these shapes are spotted. We can see S twice and both of these shapes have diagonal stripes. U = spotted shape S = stripey shape Let's look at the second letters. What do both of the shapes with a D at the end have in common? They both have four sides, and the shapes with F at the end have five sides. The mystery shape is spotted (U) and has five sides (F), so the code must be UF. Remember to always look for the common letter.
  • Question 5

You're halfway through this activity already!

 

 Look at the shapes below.

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

 

 

CORRECT ANSWER
FL
EDDIE SAYS
How are you getting on, code breaker? There are a lot of flags here! Did you spot what the flags beginning with an F have in common? They are both pointing to the right. So, the first letter must tell us the direction that the flag is pointing. F = a flag pointing to the right G = a flag pointing to the left Let's look at the second letters. What do the flags with an S at the end have in common? They are shaded black. Did you spot that those with the second letter L are lightly shaded grey? Our mystery flag is pointing to the right (F) and is lightly shaded grey (L), so our missing code is FL. Excellent code cracking!
  • 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
RT
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. Did you spot a letter that came up more than once? We can see the letter N at the start more than once. What do both of these images have in common? They are both circles. The first letter of the code tells us about the main shape of the image. N = circle R = triangle V = rectangle Let's look at the second letter and put our fraction caps on! Those coded with T at the end are split into thirds. Those coded with H at the end are split into halves and those coded with Q at the end are split into quarters. Our mystery shape is a triangle (R) which is split into thirds (T) and so the code we need is RT. 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
SF
EDDIE SAYS
Are you getting the hang of these double codes? Let's start by cracking what the letter S means, as it appears twice in the shapes above. Both of the images with S at the beginning have three small shapes inside. S = three small shapes inside Y = two shapes inside Now, let's look at the second letters. We can see that B appears twice and both of these images have triangles inside. The second letter tells us about the type of shape inside. B = triangles inside D = squares inside F = circles inside Our mystery shape has three small shapes inside (S) and is made up of circles (F), so the missing code is SF 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

Column A

Column B

X
Dashed line
Y
Dotted line
Z
Full line
T
Triangle shape
C
Circle shape
S
Square shape
EDDIE SAYS
How many matches did you find? As always, we must start to solve the code by looking for a letter that appears more than once. In this case, the letter X appears a few times. The shapes with an X all have dashed lines, which means that the first letter of the code tells us about the line. X = dashed line Y = dotted line Z = full line Now, let's look at those second letters. Those with a T at the end are triangles, so this must mean that this letter tells us about the shape of the image. T = triangle C = circle S = square 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
KT
EDDIE SAYS
How did you do with this one? There are lots of arrows pointing in all kinds of directions here, so let's try not to get lost! The arrows with arrowheads on both ends are coded J as the first letter. So, the first letter tells us how many arrowheads the shape has. J = two arrowheads K = one arrowhead Let's now look at the second letters. Those with H at the end have a thin line. The second letter tells us about the type of line that makes the arrow. H = thin line I = thick white line T = thick black line The mystery shape has one arrowhead (K) and a thick black line (T), so the missing code is KT. Let's go onto the last question!
  • Question 10

For the final question ...

 

Look at the shapes below.

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

 

CORRECT ANSWER

Column A

Column B

T
Triangle Flag
L
Flag With Points
R
Rectangle Flag
S
Shaded Flag
N
Blank Flag
EDDIE SAYS
Did you crack the flag code? The flags with a T at the start are triangle-shaped. This means that the first letter tells us about the shape of the flag. T = triangle L = flag with a curve R = rectangle flag Let's look at those second letters. Those with S at the end are shaded and those with N at the end are blank. S = shaded N = blank Great effort, code breaker - those detective skills are really taking shape!
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