For the majority of us, it’s been years and years since we’ve taken a math class. Fortunately, many of the basics tend to stick with us, like simple addition and subtraction.

But there is one simple addition problem that has been stumping people around the world, because its numbers just don’t add up. We all know that six plus four definitely does not equal four. Yet this is the math puzzle that has gone absolutely viral.

Similarly to this head-scratching school bus logic puzzle, the math problem “6 + 4 = 4” has a trick to it.

Each of the numbers in this equation is built from matchsticks. By moving only one matchstick, you can fix the equation so that it is correct.

Scroll through below for an exclusive look at this surprisingly difficult matchstick math problem. Do you know which matchstick to move to make the math problem make sense?

Well, keep looking. Because even if you solve it once, there are at least *three* possible ways to make the equation work!

Are you able to find three different solutions? Let us know in the comments!