Talk:Armor/@comment-46.163.205.234-20131205071316/@comment-76.21.45.35-20131205130029

(armor/(armor+300)) would represent the % damage reduced (after you move the decimal places)

1- (armor/(armor+300)) would represent the multiplier. You would multiply this whole thing to your damage to determine final damage after armor. The example above in the wiki has a typo where "1-" was not added into the multiplication to the damage. So following the grineer lancer case, it would be 35*(1- (armor/(armor+300))) = 26.25

0 armor would mean (0/(0+300)) = 0/300 = 0 % damage reduced, or 1 - 0 = 1 for the multiplier, meaning you take 100% damage. You did your math wrong.