Number Series
8 questions · EasyMediumHard
A number series follows a hidden rule from one term to the next. Start with the gaps between terms, then try ratios, squares and cubes.
💡 Quick tricks
- Write the differences under the series; if they aren't constant, take differences again.
- If the terms grow quickly, check for multiplication or powers.
- Some series alternate two rules, or two series are interleaved.
📖 Full method: How to crack number series questions
🎯 Try it yourself
Tap an answer. You'll see if it's right, and why. Easy ones come first.
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Q1Easy
What comes next in the series: 13, 16, 19, 22, 25, ?
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Answer: C. 28
💡 Each term changes by 3.
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Q2Easy
What comes next in the series: 5, 10, 20, 40, 80, ?
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Answer: C. 160
💡 Each term is multiplied by 2.
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Q3Easy
What comes next in the series: 1, 4, 9, 16, 25, ?
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Answer: D. 36
💡 The terms follow squares for consecutive numbers.
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Q4Medium
What comes next in the series: 41, 56, 71, 86, 101, ?
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Answer: A. 116
💡 Each term changes by 15.
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Q5Medium
What comes next in the series: 4, 12, 36, 108, 324, ?
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Answer: B. 972
💡 Each term is multiplied by 3.
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Q6Medium
What comes next in the series: 24, 35, 48, 63, 80, ?
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Answer: D. 99
💡 The terms follow n² − 1 for consecutive numbers.
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Q7Hard
Find the missing number: 10, 32, ?, 76, 98
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Answer: D. 54
💡 Each term changes by 22.
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Q8Hard
What comes next in the series: 1, 5, 13, 29, 61, ?
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Answer: A. 125
💡 Each term is (previous × 2) + 3.
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