# Find Double and Triple Letter Codes

In this worksheet, students will identify double and triple letter codes by identifying common features among images.

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 P twice. What do both of these images have in common?

They are both made up of black shapes, so the letter P must mean that an image has three black shapes.

We can also see T used twice as a code. Both these images have two grey shapes and one black shape.

This means that the first letter in the code tells us about the shading of the image. What must S at the start mean?

That’s correct! S must mean two black shapes and one grey.

If we apply these findings, our mystery shape must begin with a code letter of S.

If we now look at the second letter in the codes, we see that D appears more than once. What do these images have in common?

They are both in a vertical position, so this must be what D means.

So the second letter tells us about the positioning of the image.

U is used as code for a diagonal from top left to bottom right.

F is the code for a diagonal from bottom left to top right.

Therefore, the code for our final shape is SU.

S for two black shapes and one grey shape, and U for a diagonal from top left to bottom right.

Let’s try another one with a three-letter code this time:

Which code should the final shape have?

We can see the letter J appears twice, what do these two images have in common?

They both have an unshaded shape inside the main shape. This means that H is used for a shaded shape on the inside and J is used for an unshaded shape on the inside. If we apply this logic, then our mystery image must have an H in the middle of its code.

What do the two images with a G in their code have in common?

They both have circles inside, so G means a circle inside and S means a square inside. If we apply this logic, then our mystery image should have an S at the end of its code.

Finally, what could the first letter of the code stand for as they are all different?

The only other feature that changes between the images is the type of shape used as the outer shape.

The letter Z must be used for an oval, which is the same as our mystery image.

If we bring this all together, our mystery image should have the code ZHS.

Z - oval on the outside

H - shaded shape on the inside

S - square on the inside

It’s now your turn to crack some codes!

Good luck detective.

Welcome code breaker.

Have a look at the shapes below.

Can you match the code to the correct description?

## Column B

L
No Straw
N
Full Cup
T
Empty Cup
S
Straw In Cup

OK, one down - are you ready for the next?

Have a look at the shapes below, code breaker.

Can you match the code to the correct description?

## Column B

B
Blank Shape
R
Striped Shape
S
W
Rectangle
H
Triangle

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

Can you find the code for the mystery symbol?

Can you work out the code for the mystery symbol?

Let's keep going with this, code breaker, you're on a roll!

Can you work out the code for the mystery symbol?

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.

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.

Have a look at the shapes below, codebreaker.

Can you match the code to the correct description?

## Column B

L
Dotty Heart
R
Striped Heart
D
Heart On Left-Hand Side
B
Heart On Right-Hand Side
S
Blank Heart

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.

Last question coming up!

Have a look at the shapes below, codebreaker.

Can you match the code to the correct description?

## Column B

F
Stripey Shape
T
3-Sided Shape
D
4-Sided Shape
S
Dotty Shape
• Question 1

Welcome code breaker.

Have a look at the shapes below.

Can you match the code to the correct description?

## Column B

L
Full Cup
N
Empty Cup
T
No Straw
S
Straw In Cup
EDDIE SAYS
OK code breaker, how did you do? Are you feeling like a glass half-full kind of detective right now? What do you notice about both of the images with L at the start of their codes? They both have drinks inside the cup. What drink do you think it is? This means that the first letter of the code tells us if the cup is full or empty. L = full cup N = empty cup Now, let's look at the second letter of the code. The cups with T at the end don't have a straw and the cups with an S at the end do. Let's hope they are paper straws and environmentally friendly! Did you follow this? If you didn't get it right first time, don't worry - these things take practice!
• Question 2

OK, one down - are you ready for the next?

Have a look at the shapes below, code breaker.

Can you match the code to the correct description?

## Column B

B
Triangle
R
Rectangle
S
Striped Shape
W
Blank Shape
H
EDDIE SAYS
How did you find this one? Did it confuse you a little because the codes were written at the top and bottom of the shape rather than underneath? Don't let a little thing like that bother you - just follow the same method and you'll soon have those codes cracked. All of the images with B at the top of their codes are triangles, did you spot that? This means that the top letter of the code tells us what sort of shape is inside. B = triangle R = rectangle Let's now look at the bottom codes in the images. Those with an S at the bottom are striped shapes. This means that the bottom letter tells us about the pattern inside the shape. S = stripey W = blank H = shaded Code cracked! Keep up the great work, detective!
• Question 3

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

Can you find the code for the mystery symbol?

HW
EDDIE SAYS
Did you manage to crack the code? Remember to always start by looking for the pattern between shapes with the same code. We can see that the letter R appears twice at the beginning of codes. What do both of these shapes have in common? They are both made of water droplets. The first letter of the code tells us the shape of the image. R = water droplet H = heart Now, let's take a closer look at the second letter. Those with a T at the end are made up of three layers and those with a W at the end are made up of two layers. Our mystery shape is a heart (H) and made up of two layers (W), so it gets the code HW. Keep up the hard work (HW) detective!
• Question 4

Can you work out the code for the mystery symbol?

DT
EDDIE SAYS
Did you manage to decode our images here? Remember to always start by looking for the pattern between shapes with the same code. The images with wiggly lines have W at the start of their codes. This means that the first letter of the codes tells us about the line type. W = wiggly F = full line D = dashed line The mystery image has a dashed line, so it's code will begin with D. Now, let's look at the second letters. Those with a T at the end have three lines and those with Z at the end have two lines. The mystery shape also has three lines (T), so needs to be coded DT.
• Question 5

Let's keep going with this, code breaker, you're on a roll!

Can you work out the code for the mystery symbol?

BS
EDDIE SAYS
Did you crack the code here? We can see two letter T's at the start of the codes. What do both of these images have in common? They both have a triangle at the top of the square. The first letter of the code tells us where the triangle is. T = triangle at the top B = triangle at the bottom Now, let's have a look at the second letters of the codes. There are two W's and both of these images have a blank triangle, whereas the image coded S has a shaded triangle. W = blank triangle S = shaded triangle The mystery shape has a triangle at the bottom (B) and the triangle is shaded (S), so it is coded as BS. Let's keep on cracking these codes!
• Question 6

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.

ST
EDDIE SAYS
How did you get on, letter detective? Did you look for a letter that came up more than once? We can see the letter S appears twice. But, what do these flowers have in common? They both have stems, whereas the others are just floating in the air. S = flower with a stem N = flower without a stem The mystery flower has a stem, so it will have an S at the start of its code. There are two E's at the ends of the codes and both of these flowers have one petal shaded. The second letter of the code tells us how many petals are shaded. E = one petal shaded T = two petals shaded Z = no petals shaded The mystery code has two petals shaded (T), so the code we need for this flower is ST. Excellent code cracking!
• Question 7

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.

RC
EDDIE SAYS
Right, we are making great progress with these, letter detective! Did you notice the two R's at the start of the codes? Both of these images have three small shapes inside. The first letter of the code tells us how many shapes are inside. R = three shapes W = two shapes The mystery image has three shapes, so make a note of the code R. If we look at the second letter, we can see two T's. What do these images have in common? They are made of triangles. The second letter of the code tells us about the type of shape inside. T = triangles S = squares C = circles The mystery image has three small shapes (R) and is made up of circles (C), so the code we need here is RC. Are you getting the hang of this now?
• Question 8

Have a look at the shapes below, codebreaker.

Can you match the code to the correct description?

## Column B

L
Heart On Left-Hand Side
R
Heart On Right-Hand Side
D
Dotty Heart
B
Blank Heart
S
Striped Heart
EDDIE SAYS
How many matches did you find? Let's look at the letter R as it comes up a total of three times. All of these hearts are on the right-hand side of the image. This means that the first letter of the code tells us where the heart is. R = heart on the right L = heart on the left Now, let's look at the second letters of the codes. Those with a D at the end have dotty hearts. The second letter of the code tells us about the pattern inside the heart. D = dotty heart S = stripey heart B = blank heart Well done if you got all those correct.
• Question 9

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.

DB
EDDIE SAYS
Now, this was a bit of a challenge. Did you manage to crack the code? What do the images with D at the start of the codes have in common? They both have a shaded shape inside. This means that the first letter of the code tells us if the inside shape is shaded or not. D = inside shape shaded L = inside shape blank Now, for the second letter of the code! The second letter tells us about the pattern of the background. P= spotty background S = stripey background B = blank background The mystery image has a shaded shape inside (D) and a blank background (B), so it gets coded as DB. Did you keep up? These ones are tricky but the more you do, the easier they will become.
• Question 10

Last question coming up!

Have a look at the shapes below, codebreaker.

Can you match the code to the correct description?

## Column B

F
4-Sided Shape
T
3-Sided Shape
D
Dotty Shape
S
Stripey Shape
EDDIE SAYS
Did you spot any matches? Let's start by looking at the letter F, as it appears twice. What do both of these shapes have in common? They look completely different but if you count the sides, you'll see that they both have four sides. The first letter of the code tells us how many sides the shape has. F = four sides T = three sides If we look at the second letters, we can see two D's. Both of these shapes are covered in dots. The second letter of the code tells us about the pattern inside the shape. D = dotty S = stripey Codes cracked! Great job, detective - that is another activity solved!
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