What is 1 divided by infinity?

0 is your answer (not a number close to zero). Or mathematicially more precise: approaches zero. Remember that infinity is not a number but is is treated as if it is something larger than any number. If we divide 1 by bigger and bigger numbers, then the quotient get closer and closer to 0, therefore 1 divided by infinity is zero. We can even say that 1 divided by negative infinity equals zero because if we divide 1 by a negative million, or negative billion, etc. the quotient goes to 0.