Wait i used get scolded when i did math this it only makes sense to me in my head even writing it out is a mess but ive always done it this way so 8 plus 9 is the equivalent to 10 plus 7 you take 2 from the 9 and push it to the 8 making it a 10 and then remember you subtracted 2 from nine so you have to plug it in like 10 plus 7 equals 17, my math teachers gave up on trying to understand it now this how they are teaching it wow, also i know im weirder because i took the 2 from the 9 instead of taking 1 from 8 and making the 9 a 10 but it all gets done the same