Since this is a short week (no school for Jack tomorrow), he came up with his own math equation, which I thought was cute.
Jack: I was good at school ALL last week, remember.
me: I remember. You had a great week and your teacher was really proud of you. (I gave him a big hug)
Jack: This week there's only 2 days of school, so if I'm good for those days then I will have 2 whole GOOD WEEKS of school!
me: (laughing) That's a good way to figure it I guess. Then you can try for 3 weeks!
Jack: I don't think I've had 2 good weeks yet... have I?
me: Sigh...probably not.