11+ Verbal Number Series Practice
Discover the mathematical pattern or alternating rule linking a sequence of numbers, then determine the next numbers in the series.
Untimed Number Series Test
Practise systematically without the pressure of a timer. 8 questions drawn randomly from the 30-question bank.
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5 min Timed Test
Sharpen speed and focus for 11+ test day. 8 questions in 5 min.
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Techniques and Exam Habits
Key rules and methods to solve Number Series quickly and accurately.
Rule 1: Calculate differences between adjacent terms first
Write down the difference between each consecutive number (+3, +5, +7 or x2, x2, x2). Often the difference itself forms an arithmetic progression.
Rule 2: Check for alternating (interleaved) two-stream sequences
If numbers jump up and down erratically, separate them into odd-positioned terms (1st, 3rd, 5th) and even-positioned terms (2nd, 4th, 6th).
Pattern: Multiply by 2, then subtract 1 (×2, −1, ×2, −1, ×2, −1).
Next term: 18 − 1 = 17.
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