Despite years of concern about the accuracy of axillary (armpit) temperatures, a recent study shows that the difference between axillary and rectal temperatures in a newborn nursery was only 0.02 degrees F. When taking 2 rectal temperatures on the same baby, the average difference was 0.45 degrees. Temporal artery temperatures tended to overestimate temperatures. More data is needed in older children, but this information allows us to believe axillary temps as accurate. And, a $10 digital thermometer is better than a more expense temporal artery thermometer. Ear temps are notoriously not accurate in children.
You do not need to add degrees to the temperatures, just report the temp you obtain.