Map letters through a stated or inferred reversed-alphabet pairing.
Free to use and free to share. There is no sign-up, no score, and nothing a child does here is recorded or sent anywhere.
Practise it now
COULD became XLFOW. The message came back as FHVW. Use the same code to work out the real word.
It covers most of this skill rather than all of it.
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A worked example
One question of the kind this skill is tested with, worked all the way through: the reasoning, and what the wrong answers are there to catch.
Pairing letters from both ends
In the mirror alphabet A pairs with Z, B pairs with Y, C pairs with X, and so on all the way to M and N. Which letter pairs with O?
Work one pairing out and see why the two positions always add to 27.
K
M
L
N
Answer: L
How you get there
O is letter number 15 counting forwards from A, so its mirror is letter number 12 counting forwards, which is L. A quicker check: the two positions always add up to 27, and 15 + 12 = 27. Every wrong answer sits within three places of it, which is where you land if the two alphabets are lined up a place or two out.
Why the other answers tempt
Lining the two alphabets up one place out gives a letter right next to the real answer, and it looks just as convincing.
If they are stuck, say this
Write A B C along one line and Z Y X under it. The two positions of a pair always add up to 27.
COULD became XLFOW. The message came back as FHVW. Use the same code to work out the real word.
In a mirror code the alphabet is folded in half: A pairs with Z, B with Y, and on inwards until M pairs with N. That is why USED and FHVW go together, and why the same fold turns the code back into the word. Two things make this fast. The first is that the positions of a pair always add up to 27, so a letter at position 7 pairs with the letter at position 20 without any counting along. The second is that the letters have very different costs. A, Z, M and N are free because they sit on a landmark, while U sits several steps from every landmark there is, and that is the letter worth checking twice. A mirror code is also its own undoing, so there is no separate method for reading a message and writing one. Whatever you do to a letter, doing it again brings the letter back.
What to say if they get stuck
Write the alphabet forwards, then write it backwards underneath so A sits over Z and B sits over Y. Every letter now has a partner.
Counting works from either end. U is the 21st letter from the start, so its partner is the 21st letter from the end.
The mirror undoes itself. Pairing up a coded letter gives you the real one, exactly the same way round.
Where apply mirrored alphabet pairing sits in the 11+
The 11+ does not test these skills in isolation, and practising one in the wrong order wastes the practice. These are the skills the curriculum map connects this one to.
Both transform letters by alphabet position, but use different invariants.
How apply mirrored alphabet pairing differs from the skills beside it
The same exercise practises one other skill, and telling them apart is often the difficulty rather than the exercise itself. On this page the skill is: map letters through a stated or inferred reversed-alphabet pairing, and it stops where one fixed involutive mapping.
Questions parents ask about apply mirrored alphabet pairing
Answered from what the skill map records about this skill, not from a template. Every answer here is on the page, and the same questions are the page's FAQ structured data.
Map letters through a stated or inferred reversed-alphabet pairing. It is one of 26 named verbal reasoning skills in the 11+, in the code strand, and this page carries 1 interactive exercise that practises it.
Lining the two alphabets up one place out gives a letter right next to the real answer, and it looks just as convincing. The wrong answers on this skill are built out of that, not out of random numbers, so it is worth naming out loud before your child meets it under time pressure.
Point at the next move rather than explaining the whole rule. Write A B C along one line and Z Y X under it. The two positions of a pair always add up to 27.
The skill map draws the line here: One fixed involutive mapping. A question past that line is testing a different named verbal reasoning skill, which is worth knowing before you spend a week practising the wrong one.
The skill map connects it to apply a letter shift. Both transform letters by alphabet position, but use different invariants. That skill has its own page here.
Use Break the code FHVW, embedded on this page. It is the exercise the skill map attaches to apply mirrored alphabet pairing, it runs in the browser with no account to make, nothing is scored, and nothing a child does here is recorded or sent anywhere. It also has its own link, so you can send it to a child without sending them anywhere else first.
Verbal reasoning is a set of question types, not a subject to revise
A free diagnostic works out which of the codes, analogies, word puzzles and logic types are already secure, and which are not.
