The MinutePhysics series has always been a goldmine of interesting facts and science explainers. But prepare to have your mind blown wide open this time as Henry Reich shows you an alternate way to manually subtract large numbers—by doing addition instead.

It seems a little complicated at first, but that’s because most of us were taught the more traditional way to subtract numbers back in grade school. After watching this video a few times, this method actually seems a little easier. And it makes you wonder if all those math tests you bombed weren’t actually because you weren’t good with numbers.