Why do these kinds of puzzles make us addicted?
This type of problem plays with our expectations. We think there’s only one universal rule… when in reality, several lines of reasoning can coexist. As a result, everyone defends their solution, convinced they’ve grasped “the correct logic.”
This is also what makes these puzzles so popular on social media. They test not only your calculation skills, but above all your creativity, your ability to spot patterns, and your mental agility.
A first, very widespread logic
Some internet users have noticed a simple rule: the first number is multiplied by the second, then added to the first.
For example:
2 + 5 = 2 + (2 × 5) = 12
3 + 6 = 3 + (3 × 6) = 21
Applying the same logic:
5 + 8 = 5 + (5 × 8) = 45
For many, this answer seems obvious… but this is only the beginning.
A logic based on remembering the results
Others have observed that each result also depends on the previous one. In other words, the calculation “remembers” what was found before.
1 + 4 = 5
2 + 5 = 2 + 5 + 5 = 12
3 + 6 = 3 + 6 + 12 = 21
Continuing:
5 + 8 = 5 + 8 + 21 = 34
Here, we add the two numbers together, then add the previous result. Simple, but clever.
A sequel that evolves on its own
Some even more playful minds noticed that the results seemed to progress according to an internal rhythm, almost independent of the additions displayed.
We start at 5, then add 7, then 9… Each step increases by 2. Following this progression:
21 + 11 = 32
This solution appeals to those who like to see math as a story that unfolds, rather than a simple operation.
