   SEARCH HOME Math Central Quandaries & Queries  Question from ANNE, a parent: There was a question about what do you get when you divide Zero by infinity. There was an example using Potatoes. Could someone please explain a little bit more in detail, so that I can help my son who has Schizophrenia understand. He is big into Mathematics and is consumed by this question. Thankyou so much, Anne Anne,

We don't 'divide by infinity' because infinity is not really a number. What we do is divide by a large number and let that large number keep growing (approaching infinity). We call this taking limits as the number tends to infinity.

If you take 0 and divide by 100, what would you get? If you take 0 and divide by 1000, what would you get? If you take 0 and divide by 10000, what would you get? And so on. Regardless of what large number we're dividing by our answer is 0 and by letting this large number increase (as much as we please, tending to infinity) the answer is still 0. Thus the 'answer' to your question is 0.

You might also look at my answer to a questiion about 1/infinity.

Penny     Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences.