Does anyone else use Math Expressions by Houghton Mifflin Harcourt? What are your thoughts? I'm really struggling with this series. It jumps around so much and switches concepts constantly. I don't feel like my kids are grasping the point. We also just keep working with the same manipulatives over and over and over...there is nothing fun that captures their attention. I'm trying to follow it as closely as I can because we are trying to build continuity throughout the building with math language and what not, but this series SOOOO BORING!!!