Bob H has given the best way to do your scores especially at the national and world level shoots add your score DO NOT subtract. The reason for this is if you subtract 10 from 440 = 430, 10 from 330 = 320 and this happens people forget they are shooting a 40 target range and subtract like they do at a club shoot or other qualifier. Once you sign that card the score you have on it is yours it does not get changed once it is turned in so add and then add again because I do not want to be the one that tells you that you made a mistake and it can not be changed and it cost you 1st place, this sounds like preaching but make sure it is right this is probably one of the worst things to deal with at the shoots.