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."
Another pinner said: I add each cat chased 8 mice (ounces). I know it doesn't start with O, but they are small and so are ounces. Plus the kids always think it is so funny that the kingdom/castle becomes infested with mice!---I teach the Big G, but I like the story that goes with it...might help some kiddos!