This chart contains resources for every piece of a well run math RtI system. It includes what to use for screening, progress monitoring, tier 1 curriculum, and a lot of intervention materials. The intervention resources are broken up by big ideas: algebra, number sense/operation, geometry/measurement, data/probability. It could be used if planning a school wide system or it could be used if you are a just a teacher with an intervention group that needs help with , for example, decimals.
The Teaching Channel has a wide arrange of videos. This one is a part of the "Connecting Math to Real World Tasks" series and focuses on collaboration in elementary math. It is interesting and only about four minutes long.
From the U.S Department of Education, this 104 page "practice guide" is a most comprehensive manual on RtI in math. While it may not be light reading, it is a must read (or skim) if you are going to a teaching or admin interview or if you want to really dive into tiered math instruction. The charts are very easy to understand and use.
Meeting the needs of advanced learners can actually be more challenging than providing intervention to those who need it. Here is a blog post with four excellent and free tech tools that can be used with advanced learners.
While almost all elementary teachers are well versed in guided reading, many do not know of "guided math". This book will provide everything needed to wrap your head around using a guided math model in the classroom. Guided math allows for differentiation and includes all the components of an engaging and effective lesson!
Misunderstood Minds is a compelling and powerful project through PBS. It allows the reader or watcher, to learn about and truly understand different types of disabilities or learning difficulties. This is page explains different types of math difficulties students may face and also allows you to try to solve math problems with the specific disability or learning difficulty. Every teacher and parent should explore this site!