one of my favorite examples of an interactive Math notebook dandelions and dragonflies: Interactively Math! This is adorable - put the multiples in the M! I think this would help reinforce the word multiple. Love this idea for my future students!
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.