These couple of weeks I have been learning to use different ways to solve different problems. this is the way I found the easy lets say 19+86
first you want to go and put the 19 at the top then a line under the 19 then the 86 then take the one from the 6 that makes it 5 then one away from the 8 then add it to the 1. Then you have the answer is 105 this is the photo.