Another site/link rec. from Dr. Nickie "Angles is a 4th Grade Standard in the CCSS. Here is a great set of activities to have students do in their math journals. I (Dr. Nickie) really like it because it is interactive, engaging and standards-based. Check it out!Types of Angles math journal @ Runde's Room."
Great description of math journaling in one classroom. Each two-page entry has the learning objective, that objective reworded by the student, what they knew beforehand, what they learned, their proof that it is so, a reflection of their choice, and a "foldable" interactive example. She even brings in left and right brain thinking by having the words and proof on the left side and the art and color on the right. :o) I definitely need to check out her other posts soon!