How to round a integer to the close hundred?

Question

I don\'t know it my nomenclature is correct! Anyway, these are the integer I have, for example :

76
121
9660

And I\'d like to round them to

Answer 1

Just some addition to @krizzzn's accepted answer...

Do note that the following will return 0:

Math.Round(50d / 100d, 0) * 100;

Consider using the following and make it return 100 instead:

Math.Round(50d / 100d, 0, MidpointRounding.AwayFromZero) * 100;

Depending on what you're doing, using decimals might be a better choice (note the m):

Math.Round(50m / 100m, 0, MidpointRounding.AwayFromZero) * 100m;