Think you’re good at mental math? This is a challenge that will test your skills! A seemingly simple mathematical puzzle, but one that requires concentration and a perfect mastery of the rules of arithmetic.
This challenge, shared by Dr. Saba Osmaan on X (formerly Twitter), has attracted the attention of thousands of internet users. Can you find the solution in 10 seconds, without making any mistakes?
Why are these puzzles so popular?

Mathematical challenges aren’t just fun; they’re also good for the brain. Solving them improves your logic, concentration, and analytical speed.
With these exercises, you can:
- Strengthen your memory by practicing your ability to remember and apply mathematical rules.
- Improves concentration by allowing you to focus on a specific task under time pressure.
- Avoid common mistakes , which are useful in daily and professional life.
A thought-provoking comparison
This is the challenge that has sown doubt among many internet users:
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