From Psychologies · La Rédaction · · 2m
The math trap that catches everyone
A deceptively simple calculation tests whether you can resist rushing and follow the correct order of operations.
In brief
A deceptively simple calculation tests whether you can resist rushing and follow the correct order of operations. Parentheses create a hierarchy that must be respected from innermost to outermost, or the entire calculation fails. Originally reported by Psychologies.
A simple calculation hides a trap
This math problem looks easy at first glance, but one detail about parentheses is enough to make most people choose the wrong answer. You have 30 seconds to solve it correctly.
Why your brain wants to rush
The calculation seems short and harmless with no huge numbers or strange symbols. This false sense of ease is exactly what makes people fall into the trap by answering too quickly.
What this challenge really tests
This isn't about being a math expert. It tests your logic with nested expressions, your concentration under time pressure, your mental speed without rushing, and your respect for calculation priorities.
The problem you need to solve
100 minus (30 minus (5 times 4 plus 2)). Read it twice. Don't just go fast. Avoid the first reflex that comes to mind.
Parentheses are doors to open in order
Your brain loves shortcuts and tries to assemble operations quickly. But parentheses work like doors that must be opened in the correct sequence. Skip one and the calculation tells a completely different story.
The minus sign is often underestimated
Many people treat the minus sign in front of a parenthesis as just a separator, when it actually influences everything that follows. This subtle detail is decisive and causes most errors.
Step one: the innermost parenthesis
Start with the deepest parenthesis containing multiplication and addition. This is the heart of the trap. If you treat this part too fast or in the wrong order, the entire calculation collapses.
Step two: work outward carefully
Once the inner parenthesis is solved, move to the next level. Many people make mistakes here because the subtraction in this block requires you to preserve the meaning of the expression.
The answer is 92
If you found this in under 30 seconds, your concentration was perfect. If you fell into the trap, that's exactly what this calculation is designed to do. It tests how you observe under pressure.
The big picture
Parentheses create a hierarchy that must be respected from innermost to outermost, or the entire calculation fails.
