On the first day of the school have the students make their hand print, fill out an info sheet with the teacher, and measure their height in yarn. Then wrap it up like a time capsule and put a label on it that says "do not open until (the last date of school). Open the time capsule and do the same thing at the end of the year to see how much they have grown and changed.
Fun way to reinforce place value. Students get a digit, comma or decimal, teacher says a number, students have to get themselves in order to represent that number. Kiddos will REALLY enjoy this- first week of school activity for place value