Identify 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, we're pleased to see you!

Have a look at the shapes below.

Can you match the code to the correct description?

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

Have a look at the shapes below, code breaker.

Can you match the code to the correct description?

(Not sure the image works for 2 pointed shape!?) suggest a thick black arrow with a point at either end.

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

Can you work out the code for the mystery symbol?

NKB

NKG

NIB

TKG

NIG

Look at the following shapes.

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

LVG

CVG

LVZ

HVG

CXG

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.

GWQ

LWR

FWQ

UDR

UWQ

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.

LUZ

LUV

RUZ

LHZ

RWV

Have a look at the shapes below, code breaker.

Can you match the code to the correct description?

LAQ

LAC

SRC

LRK

SAI

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.

PF

BF

YF

YL

YS

Last question coming up!

Have a look at the shapes below, code breaker.

Can you match the code to the correct description?

XBD

RBD

VLS

VBW

VBD

• 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?

EDDIE SAYS
OK code breaker, how did you do? With this type of question, we always need to look for a letter that appears more than once and try to work out the similarity between the images. What did you notice about both images with an R at the top? They both have a triangle at the top of the image. The top letter of the code tells us which type of shape is at the top. R = triangle Q = square L = circle Now, let's look at the bottom codes. There are two V's and both of these images have a five-sided shape at the bottom of the image. The bottom letter of the code tells us how many sides the bottom shape has. V = five sides U = four sides X = six sides The mystery shape has a square at the top (Q), and a six-sided shape at the bottom (X), so the code it needs is QX. 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 one?

Have a look at the shapes below, code breaker.

Can you match the code to the correct description?

(Not sure the image works for 2 pointed shape!?) suggest a thick black arrow with a point at either end.

EDDIE SAYS
Did you crack the code here? All of the images with H at the top have a triangle inside them. The first letter of the code tells us what shape it is. H = triangle W = diamond F = star The mystery image has a triangle, so we need to remember that code, H. Now, let's look at the bottom letters of the codes. There are two L's and both of these images have a small shape in the top left corner. The bottom letter of the code, therefore, tells us where the small shape is. L = top left corner B = bottom left corner R = top right corner The mystery image has its small shape in the bottom right corner and this doesn't match any of our cracked codes so far. This means that we need a completely new letter at the bottom. The answer is HT as it has to begin with H and can't be L, B or R at the bottom. That was a tricky one, well done if you got it!
• Question 3

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

Can you work out the code for the mystery symbol?

NKG
EDDIE SAYS
Did you manage to crack the code? The images with T at the start have circles at the corners of the rectangle, looking a bit like ears! The first letter of the code tells us where the circles are. T = circles wide apart at the corners N = circles close together Now, let's look at the middle code. Those with I in the middle have circles with thin lines, and the one with K in the middle has circles with bold lines. The mystery image has circles close together (N), which have bold lines (K). So, we just need to work out the last letter of the code. If we look at the last letter of the codes, there are two B's and both of these rectangles have diagonal lines. So, the last letter of the code tells us about the lines inside. B = diagonal G = vertical So, our last letter is G, which gives us the code NKG. We did it!! Keep using those detective skills!
• Question 4

Look at the following shapes.

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

LVG
EDDIE SAYS
Another WHOPPING three-letter code to crack here, letter detective! There are two C's at the front of the codes, and both of these images have hearts with bold lines. The first letters of the codes tell us about the heart. C = bold heart H = thin heart L = double-layered heart The mystery shape has a double-layered heart, so we need to remember L. There are two V's in the middle, and both of these images have a four-sided shape at the bottom. The middle code tells us how many sides the bottom shape has. V = four sides X = six sides E = five sides The mystery shape has a four-sided image, so we should remember it needs a V in the middle. Onto that last letter! There are two R's at the end and these shapes have vertical stripes, so we know that the last letter must tell us about the lines inside the bottom shape. R = vertical stripes Z = horizontal stripes G = diagonal stripes The mystery shape has diagonal stripes so needs a G at the end. This makes the code that we need LVG.
• 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?

EDDIE SAYS
Did you crack the code here? First, we need to find a common letter among the top codes. We can see V twice, and both of these images have ovals as their main shape. The top letter of the code tells us what type of shape is inside. V = oval T = rectangle If we look at the bottom letter of the codes, there are two F's and both of these images have a straight line cutting through them. The bottom letter tells us about this line. F = straight line C = curved line The mystery image is made up of a rectangle (T) and has a curved line going through it (C), so the code we need here is TC. On we go, code breaker!
• 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.

FWQ
EDDIE SAYS
Which way do we turn with this one, code breaker? The arrows with U at the start of their codes are going up. The first letter of the code tells us where the arrow is pointing. U = up F = left G = right The mystery shape is pointing left, so remember F for the start of the code. There are two D's in the middle codes and these arrows have shaded shapes inside, so the middle of the code tells us if the small shape inside is shaded or not. D = shaded shape W = blank shape The mystery arrow has a blank shape inside (W) so now we know the code is FW so far. Finally, let's look at the last letters of the codes. The arrows with Q at the end have squares inside, and so does our mystery shape, so we have cracked it. Our mystery shape needs the code FWQ. 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.

LUZ
EDDIE SAYS
Did you look for the common letter? The images with R at the start are made up of shaded circles, so the first letter of the code tells us if the shapes are shaded or not. R = shaded circles L = blank circles Our mystery image has blank circles, so we need to remember the code L. Next, there are two U's in the middle code. What do these images have in common? They are both made up of four circles. The middle letter tells us how many circles make up the shape. U = four circles H = three circles W = two circles Remember U, as our mystery shape has four circles. Moving onto that final letter! There are two Z's for the last letter of the code and both of these images are in a horizontal position. Therefore, the last letter of the code tells us which position the shape lies in. Z = horizontal V = vertical As our mystery shape is horizontal, we know the last letter of the code must be Z. We've done it! Our mystery shape needs the code LUZ. Keep up the great work, code breaker - you've got this!
• Question 8

Have a look at the shapes below, code breaker.

Can you match the code to the correct description?

LAC
EDDIE SAYS
Another mammoth three-letter code, letter detective! We are working really hard! Those with S at the start of their codes have lightly shaded outside lines. The first letter of the code tells us about the outside lines. S = lightly shaded B = heavily shaded L = blank lines We need to remember the letter L, as our mystery shape has blank lines. Next, we look at the middle code letter. There are two A's in the middle code and these images are split into two sections. So, we now know that the middle code tells us how many sections the shape is split into. A = two sections R = three sections U = four sections The mystery shape is split into two sections, so we need to remember first L, and now A! Finally, we should look at the last letter of the code. There are two Q's and in both of these images the main shape is a square, so our last letter tells us about the main shape. Q = square I = circle C = rectangle Our mystery shape is a rectangle, so we need the code C to finish this one off. LAC, do you see?
• 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.

YF
EDDIE SAYS
A nice two-letter code for us here! Those with a P at the beginning of their codes are triangular prisms. The first letter of the code tells us what type of 3D shape is in the image. P = triangular prism Y = cylinder B = cuboid There are two L's at the end, and both of these shapes are blank. The second letter tells us about the shading of the shape. L = blank F = one face shaded The mystery shape is a cylinder (Y) and has one face shaded (F). The code we need to crack this time is YF. On we go to the last question, code breaker!
• Question 10

Last question coming up!

Have a look at the shapes below, code breaker.

Can you match the code to the correct description?

VBD
EDDIE SAYS
Lots of codes to crack here! Let's start as always with the first letters. The flowers with X at the start have six petals. The first letter tells us how many petals there are. X = six petals V = five petals R = four petals There are two L's in the middle and both of these flowers have blank centres. The middle code must, therefore, tell us if the centre of the flower is shaded or not. L = blank centre B = shaded centre Now, we move to the final letter of our final question, and you know what to do! There are two S's in the final code and these petals are stripey. This final letter tells us about the petal patterns. S = stripey petals D = dotty petals W = blank petals Our mystery flower has five petals (V), a shaded centre(B) and dotty petals (D), which means that our final code is VBD. Codes cracked! Great job detective, that is another activity solved!
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