I use math journals in my Math Workshop. I like the idea of using Math Journal Sentence starters with my students. This would serve as a great way to incorporate writing in math and allow students to expand their thinking.
Use for addition, subtraction -then discover how to set up for multiplication Math Facts Baseball - Practice addition and subtraction facts! There's a great statistics lesson in here too. This would really be a great project for any elementary grade.
Grandma's Place Value Quilt- Help Grandma pick the colors for her quilt according to place value. Such a fun way to practice place values in Grade! It's in the Back to School NO PREP Packet for Second Grade!