Math Journals - 1st, 2nd, 3rd, 4th, and 5th grade versions available. 4 prompts for each Common Core Standard
Diary of a Not So Wimpy Teacher: Teaching Students to Write About Math
Math Tools for Reference! - Tunstall's Teaching Tidbits
Math Journal...Love the color-coded Table of Contents! I am going to have a math Journal next year!
Smiling and Shining in Second Grade: Math Journal Prompts for Second Grade
Math Journal Prompts for Second Grade--FREE 16 math journal prompts. adapt for first grade.
Interactive Math Journals for Pre-K
Taking a composition book and getting it cut in half. Class participation points collected at the end of class?
Thinking about using kindergarten math journals in your classroom? This post shows how you can do a math journal activity in minutes!
Miss Van Maren's Fantastic First Grade: Math Journals Update (pages that go with Go Math)