Hello, what you said is a match math problem, which is a kind of math puzzle. There are brain teasers in it. Therefore, we don't have to cling to the conditions of talking about problems. Some conditions are actually traps that you can't extricate yourself from.

To do this problem, we should not stick to traditional thinking, but look at the problem from a different angle, because these problems are all intellectual problems, a bit like IQ tests.

You can get the answer by rotating 180 degrees without moving the match. Please see the picture below: