What is the value of root 7?

The square root of 7 doesn't have a simple, clean answer. It is what they call an irrational number. This means the decimal numbers go on forever and they never repeat. So you can’t write the full number down.

My phone calculator says it is about 2.64575. For most things, like for a homework problem, using 2.65 is probably good enough. It just depends on how exact you need to be. But the real, full number is endless, you know? It's one of those special numbers in math.