# Excel + Calculations

1. Oct 22, 2013

### StevieTNZ

Hi there,

If I perform the following calculation in Excel:
=100,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000+50

I get: 100,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000

100,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,050?

2. Oct 22, 2013

### phinds

No, the answer will be constrained by the number of bits used by the computer to represent the numbers, and you've got WAY more than it can handle, so the 50 gets dropped as a rounding error.

3. Oct 22, 2013

### Staff: Mentor

4. Oct 22, 2013

### StevieTNZ

Is there any other program out there that will present the result given in my original post?

5. Oct 24, 2013

### Bill Simpson

Lots of other programs can do that.
Computer Algebra Systems, like Mathematica, Sage, Maxima, Reduce, Maple... all do that.
http://en.wikipedia.org/wiki/Computer_algebra_system

Some calculator programs, like bc and many others do that.

Many programming languages, like Icon, Java... do that, don't be fooled by those who think 64 bits is big.

6. Oct 30, 2013

### Chronos

64 bits is chump change for deep calculations. You need a monster computer to process calculations beyond a few hundred decimal points. That is why numerical analysis takes so long and is so incredibly expensive.

7. Oct 30, 2013

### harborsparrow

Just for grins, try putting the smaller number first.

8. Oct 30, 2013

### phinds

Do you really think that's going to have any effect on the fact that the larger number is WAY bigger than Excel can handle as an integer?

9. Oct 31, 2013

### harborsparrow

Sometimes it does help to prevent loss of precision by putting the smaller number first, when there is a huge range of magnitude difference between two operands.

10. Oct 31, 2013

### phinds

Yes, and that does not answer my question at all. I am asking about a specific case.