Here is a letter I give out during back to school night or that can be given to parents during their conference about their child. It summarizes the core content areas and lets them know how they are currently doing and where they should be by the end of the first trimester/month depending on your report system. You can write their actual score or simply just far below, below, on, or above grade level.
I also listed some things parents can do at home with their child in each core area. They are open ended activities that will help grades K-3rd. I also included a letter in Spanish to use as needed. Enjoy!