*** UPDATED on 9/17/17 to sync up with Version 3 of Eureka Math/EngageNY. ***
The EngageNY (Eureka Math) math curriculum is pretty awesome. The teacher materials include answers for the problem sets (class practice) and assessments, but NOT the homework. I have taken care of that by creating the answer keys myself.
Answers are provided for all homework assignments. I have not yet completed answer keys for the Sprints. That will be next.