Letter Series Practice

Free · no sign-up · unlimited new questions

Letter series work like number sequences, just with the alphabet. You see a series of letters or letter groups and work out what comes next. It gets much easier if you think of every letter as a number: A = 1, B = 2, all the way to Z = 26.

How it works

• Easy: fixed steps forwards or backwards, skipped letters, or alternating back and forth.
• Medium: growing step sizes, two interleaved series, reversed sections and letter pairs.
• Hard: three interleaved series, arithmetic with alphabet positions, group patterns, mirrored sequences and vowel–consonant rules.

Sample question

A,  Z,  B,  Y,  C,  ?

Solve this question in the app ›

Tips

• Translate the letters into numbers (A = 1). Then the steps become obvious.
• Memorize a few anchor points: E = 5, J = 10, O = 15, T = 20.
• If letters come in pairs or groups of three, treat each position within the group as a series of its own.

Relevance for IQ and Mensa tests

Letter series train the same rule-spotting skills as number sequences. Similar questions appear in many intelligence tests.

Frequently asked questions

Does A count as 0 or 1?

On IQ-Fun, A = 1, B = 2 and so on up to Z = 26 — just like in most tests.

Do I need to sign up?

No. You can start practicing right away, as much as you like. You only need an account if you want to save your statistics.

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