C# how to always round down to nearest 50

Question

I\'ve done a search on C# rounding, but haven\'t been able to find the answer to my current problem.

What I want to do is always round down to the nearest 50. All th

Answer 1

Divide the value by 50, round down to the closest whole number, and multiply by 50 again:

double n = Math.Floor(n / 50.0) * 50.0;