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A fascinating mathematical challenge: Solving the mystery of calculation

Ouadie RhabbouronMay 20, 2026


Here’s how to break down the calculation:
Break down the expression:
The initial expression:
4 + 4 + 4 + 4 + 5 × 0!
The first step is to evaluate 0!, which, as mentioned, is equal to 1.
This transforms the expression into:
4 + 4 + 4 + 4 + 4 + 5 × 1
Do the multiplication:
Next, we need to do the multiplication 5 × 1, which results in 5.
So the expression becomes:
4 + 4 + 4 + 4 + 5
Add the terms:
Finally, add the numbers:
4 + 4 + 4 + 4 + 5 = 21
The answer: 21
The correct answer to the challenge is therefore 21. This math problem is a great illustration of how simple rules can sometimes be broken by unexpected elements. Despite the claim that 99% of people fail, the key to success lies in understanding the order of operations and mastering the subtle nuances, such as factorials.

The Power of Mathematical Rules
This type of challenge shows the beauty of mathematics: it is both simple and profound. It gives you the tools to solve complex problems, while showing you that sometimes rigor and patience are needed to avoid pitfalls. It is not simply about counting, but also about knowing how and in what order to apply the rules.

Mathematics also invites reflection. It reminds us to never underestimate the apparent simplicity of a problem. Sometimes even the most obvious solution hides a subtle aspect that needs to be recognized.

Conclusion: The Magic of Math

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