Need something for students to do as they transition into math class? The number of the day is a great routine for students to begin thinking mathematically! This is a PDF that can be printed onto a poster, laminated and hung in your classroom. Or, if you'd rather, you can project it onto your board and simply fill in the number each day! There is a teacher only version and a version that adds a student challenge where a student can challenge the class each day! There is a student recording sheet for the teacher version and a work space on the second page for student challenges and to show their work! I had a box in my classroom where students could write down their idea of a new rule. Examples included "multiply by 2" "add 2 tens and 3 ones" and "divide by 4". This is a great way to get kids thinking about math!