How to round numbers to hundreds

I'm using following javascript to make the calculation result round to hundreds. If calculation result is 19999,then a = 19900

a=Math.floor(b*0.0003/100)*100

Am I doing right?

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Participant

I tried it and seems working fine. But I'm new to javascript, kind of not sure if I'm doing right.

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Community Expert

If it works then what's the problem?

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Community Expert

Did you try it?

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