This resource is from NC2ML.  It may not be remixed.This Standards Brief discusses strategies and representations second graders are taught for mult-digit addition and subtraction.  This is a great reading to share during a professional development with teachers or to hand out during family math nights.  

This resource is from the North Carolina Collaborative for Mathematics Learning (NC2ML). It may not be remixed.This research brief outlines the Launch, Explore, Discuss lesson structure and the benefits to using this framework.  Many of the Tools4NCTeachers lessons follow this structure.

This Thinglink provides a series of brief videos addressing a) common areas of difficulty related to problem solving and b) an overview of additional and subtraction problem types.

This resource is from Tools4NCTeachers."Launch, Explore, Discuss" is a research-based lesson framework where students grapple with a task and then come together to share strategies used.  The introduction of new strategies is delayed until after grappling.  This is the primary lesson framework for the Tools4Teachers lessons. This resource serves as a professional development tool, explaining the benefits of this lesson framework and outlining each component.