Acronyms and songs usually help me remember sequential things. They tend to get stuck in my head and I end up singing them over and over. 🙂 Here’s a really simple one that one class came up with. https://youtu.be/y3F0SItM-os
Youtube videos might help, too. Then, he could follow along with the person doing a problem on the screen and pause/go back when he needs to see it again. That’s what I usually do when I need to figure something out. 🙂
Here’s a couple of other resources:
https://i.pinimg.com/originals/40/87/34/40873478acb1ef92d838838931f8a5c2.jpg
https://drive.google.com/file/d/0BzbzHaNolwxmdjlITGtWVEVISlU/view
This teacher teaches division like multiplication. Sometimes, just looking at it from a different perspective can make it click: http://www.ashleigh-educationjourney.com/why-i-love-teaching-long-division/
You are an AMAZING big sister!!! <3