This math problem looks incredibly simple at first glance:

9 + 3 × 4 − 2

Most people think they can solve it instantly. But surprisingly, many get it wrong—not because it’s difficult, but because they ignore one key rule in mathematics.

The order of operations.

In math, multiplication comes before addition and subtraction. If you don’t follow this rule, you’ll end up with the wrong answer.

Let’s solve it step by step:

First, handle the multiplication:
3 × 4 = 12
Now rewrite the expression:
9 + 12 − 2
Then go left to right:
9 + 12 = 21
21 − 2 = 19
It’s that simple—if you follow the correct order.

Many people rush and do the addition first, which leads to the wrong result. This is exactly why problems like this go viral—they seem easy, but they test whether you’re paying attention.