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 the values I want to round down will be in decimal. So 635.25 would be 600. 298.42 would be 250. 149.56 would be 100. I've looked at math.round but how would I use that so it always rounds down to the nearest 50 and never up?

Accepted Answer

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;
```

C# how to always round down to nearest 50

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