At first glance, this math puzzle looks almost too easy to be interesting.
The numbers are familiar. The operations are basic. There are no complicated fractions, square roots, or enormous numbers.
Yet thousands of people can arrive at different answers when they see the same expression:
50 + 50 − 25 × 0 + 2 + 2 = ?
The image even comes with a challenge: don’t use a calculator—use your brain.
That little instruction is enough to make the puzzle surprisingly tempting. You may look at the equation and immediately think you know the answer. But before checking anyone else’s response, take a moment and solve it yourself.
What did you get?
90?
79?
104?
Or perhaps something completely different?
The interesting part isn’t just the final number. The real lesson is about order of operations, a basic mathematical convention that tells us which calculations should be performed first.
And once you understand that rule, the puzzle becomes much easier.
Let’s take it step by step.
The expression is:
50 + 50 − 25 × 0 + 2 + 2
The first thing many people do is simply work from left to right.
If you do that, you might calculate:
50 + 50 = 100
Then subtract 25:
100 − 25 = 75
Then multiply by zero:
75 × 0 = 0
Then add 2 and 2:
0 + 2 + 2 = 4
That approach produces 4.
It feels logical because we often read from left to right.
But there’s a problem.
In standard arithmetic, multiplication is performed before addition and subtraction.
That means you cannot simply calculate everything from left to right.
The multiplication part must be handled first.
Look carefully at the expression:
50 + 50 − 25 × 0 + 2 + 2
The multiplication is:
25 × 0
And anything multiplied by zero equals zero.
So:
25 × 0 = 0
Now the equation becomes:
50 + 50 − 0 + 2 + 2
At this point, there are no multiplications left.
Now we can work through the remaining addition and subtraction from left to right:
50 + 50 = 100
100 − 0 = 100
100 + 2 = 102
102 + 2 = 104
So the standard answer is:
104
And that’s exactly where the puzzle becomes interesting.
The zero doesn’t make the entire expression disappear.
It only makes 25 × 0 equal to zero.
The 50 + 50 remains.
The two additional 2s remain.
So the final result is 104.
Why do so many people get these puzzles wrong?
One reason is that the human brain naturally wants to process information in the order it appears.
When you see:
50 + 50 − 25 × 0 + 2 + 2
your eyes move from left to right.
Your brain may instinctively begin calculating as it goes.
But mathematics has a hierarchy.
Certain operations have priority over others.
This is commonly remembered through the acronym PEMDAS:
Parentheses
Exponents
Multiplication
Division
Addition
Subtraction
Another commonly used version is BODMAS, which refers to brackets, orders, division, multiplication, addition, and subtraction.
The terminology may vary depending on where you learned mathematics, but the essential idea is the same.
Multiplication and division generally take priority over addition and subtraction.
That means the multiplication in this puzzle must be handled before the surrounding addition and subtraction.
There is another important detail.
Some people see the zero and immediately assume the whole equation must somehow become zero.
That’s another common mistake.
Consider a simpler example:
10 + 20 × 0
The multiplication comes first:
20 × 0 = 0
So the equation becomes:
10 + 0 = 10
The answer isn’t zero.
The zero only affects the multiplication involving 20.
The same principle applies to our viral puzzle.
25 × 0 = 0, but the other numbers remain untouched.
This is why:
50 + 50 − 25 × 0 + 2 + 2
becomes:
50 + 50 − 0 + 2 + 2
and eventually:
104
What makes these puzzles so popular online is that they are simple enough for almost everyone to attempt but tricky enough to produce disagreement.
Someone posts an answer confidently.
Another person insists they’re wrong.
A third person says the puzzle is “broken.”
Someone else brings up a calculator.
And suddenly a basic arithmetic expression becomes a heated debate.
But there is an important distinction between a genuinely ambiguous equation and one that simply tests whether someone remembers mathematical conventions.
This expression does not contain parentheses or unusual notation.
Under standard arithmetic conventions, the multiplication is performed before addition and subtraction.
So the conventional result is 104.
That doesn’t mean someone who answered differently is unintelligent.
It simply means they may have processed the expression from left to right instead of applying the standard order of operations.
And that’s actually why these puzzles can be useful.
They remind us that solving a problem isn’t always about calculating quickly.
Sometimes it’s about understanding the rules before calculating anything.
Imagine two people looking at the same expression.
Person A immediately starts adding.
Person B pauses for a second and asks:
“Which operation comes first?”
That tiny pause can completely change the result.
In everyday life, this principle appears in many forms.
Before solving a problem, we need to understand the instructions.
Before making a decision, we need to identify the important information.
Before reacting to a surprising situation, we sometimes need to slow down and look at the details.
That’s part of what makes a simple math puzzle surprisingly satisfying.
It isn’t really testing whether you can perform difficult mathematics.
It’s testing whether you can resist the urge to rush.
There is also a psychological element to these challenges.
When someone sees a puzzle described as “easy,” they may become overconfident.
They glance at it and immediately produce an answer.
Then, when another person gives a different result, they become convinced that someone must be wrong.
But the best approach is much simpler:
Slow down.
Read the entire expression.
Identify the operations.
Apply the standard rules.
Then calculate.
This method works far better than guessing.
Let’s look at the puzzle one more time.
50 + 50 − 25 × 0 + 2 + 2
Step one:
Find the multiplication.
25 × 0 = 0
Step two:
Replace it.
50 + 50 − 0 + 2 + 2
Step three:
Calculate from left to right.
50 + 50 = 100
100 − 0 = 100
100 + 2 = 102
102 + 2 = 104
Final answer:
104
And there is a little mathematical fact hiding inside the puzzle that makes the zero especially interesting.
Zero is one of the most powerful numbers in arithmetic because of its behavior under multiplication.
Any number multiplied by zero becomes zero.
5 × 0 = 0
100 × 0 = 0
1,000,000 × 0 = 0
Even an enormous number multiplied by zero equals zero.
But addition behaves differently.
Adding zero changes nothing.
100 + 0 = 100.
That’s exactly what happens after the multiplication in this puzzle.
The 25 disappears from the calculation because it has been multiplied by zero, but the surrounding numbers remain.
The expression therefore doesn’t collapse to nothing.
It simply becomes:
50 + 50 + 2 + 2
which equals:
104
So if you initially answered something else, don’t worry.
These puzzles are designed to catch quick thinkers.
The best part is realizing where the mistake happened.
And if you solved it correctly without a calculator, congratulations—you followed the mathematical rules rather than letting the equation trick you.
The next time you see one of these viral challenges online, don’t immediately look at the comments.
Try solving it yourself first.
Give yourself ten seconds.
Look for parentheses.
Look for exponents.
Look for multiplication and division.
Then handle addition and subtraction.
That small habit can prevent a surprising number of mistakes.
And perhaps that’s the real reason these simple puzzles remain so popular.
They create a tiny mental challenge in the middle of an ordinary day.
You see a few numbers on your screen.
You think you know the answer.
Then you stop.
You reconsider.
You discover that the answer depends not on speed, but on paying attention.
So, now that you’ve seen the explanation, go back to the original image and ask yourself one final question:
Did you get 104 before reading the answer?
If you did, you followed the order of operations correctly.
If you didn’t, now you know exactly where the trick was.
And next time, you may catch it immediately.
The final answer is 104.
Did you get it right without using a calculator? Tell us your answer before reading the comments! 
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