You are not alone. Teachers know that parents are struggling with this. Teachers are also having difficulty transitioning to teaching the new math.
Khanacademy.com Watch and rewatch. The guy is a godsend to my family's homework questions. He shows ways to solve problems in all Math areas in simple steps. Check him out!!
There are reasons they are teaching this "new" math. It may be new to us but it is not new globally. There are many methods for doing math equations and this new math is very old in other countries. I love that it shows there are many ways to come to the same conclusion. The new math is supposed to help with problem solving and spills into other higher math.
I know...I know..I too would prefer to keep it the way I learned and am familiar with. But now we are quite a few years into our kids' schooling and I can see how the new math methods will help kids in the future.
Our High School offers free Math tutoring after school and during the lunch period. Teachers are very willing to meet with students individually by appointment. Our middle schooler's math teacher also is willing to help during specified times during her day.
I am sure you could ask the teacher for some help. Teachers know parents are confused. Our third grader's teacher isn't even sending Math homework home this year because she knows parents will be confused and just revert back to what they know and teach their child the old method. So, we are simply responsible to make sure our child is doing math fact drills each day to keep those sharp. I LOVE HIS TEACHER!!!!
But seriously, check out kahnacademy.com
Good luck!!