My teacher uses a Noise Meter similar to this one. The Noise Meter is a cool way to remind students the correct noise level that they should be using! You just use the paper clip and move it to the appropriate noise level the students should be using.
For early finishers? Math Workshop Adventures Create a new number each day. When kids finish their math assignments, they work on the number of the day problem. Introduce new concepts as the year progresses (multiplication.