Fibonacci-style puzzle
What comes next
This sequence uses the previous two numbers to create the next one.
Quick answer
Answer: 34
Each term is the sum of the previous two: 3 plus 5 is 8, 5 plus 8 is 13, 8 plus 13 is 21, so 13 plus 21 is 34.
How to use it
1
Test whether two terms combine.
2
Add neighboring pairs.
3
Confirm the rule repeats.
4
Add 13 and 21.
What this trains
Sequential reasoning
Working memory
Mental arithmetic
Rule verification
IQFlow
Try it inside IQFlow
IQFlow turns short cognitive checks into a broader profile across reasoning, memory, focus, and speed.